At Kerr Robichaux & Carroll, we know veterans deserve clear, accessible information when pursuing VA disability benefits. To build a successful claim, it’s essential to understand how service connection works. Veterans must establish a direct link between their military service and the medical conditions they suffer from today or meet eligibility for a presumed connection. This guide serves to illustrate some conditions that you may not realize could qualify you for VA Disability benefits.
Understanding Key VA Disability Terms: What Every Veteran Should Know
When applying for VA disability benefits, understanding how the VA evaluates and connects medical conditions to military service is critical. At Kerr Robichaux & Carroll, we help veterans navigate this complex process by simplifying the language the VA uses. Below are five important terms that frequently come into play when filing or appealing a VA disability claim:
Direct Service Connection
A direct service connection means that your disability was caused or aggravated by your active-duty service. To establish this, you typically need three elements:
- A current medical diagnosis,
- Evidence of an in-service event, injury, or illness,
- A “nexus” or medical link between the two.
This is the most straightforward path to receiving benefits, but it still requires strong medical and service records.
Secondary Service Connection
If your disability developed as a result of, or was aggravated by, another service-connected condition, you may qualify under a secondary service connection. For example, if you have service-connected PTSD and later develop irritable bowel syndrome (IBS) due to the stress and medications involved, the IBS may be granted service connection secondarily. These claims require a clear medical nexus linking the secondary condition to the original one.
Presumptive Service Connection
In some instances, the VA presumes that a condition is service-connected, meaning the burden of proving the connection is lifted from the veteran. This applies to veterans exposed to specific hazards (like Agent Orange), those who served in designated areas during certain conflicts (such as Gulf War veterans in Southwest Asia), and former POWs. The VA provides a list of these presumptive conditions, and if your diagnosis is on that list, the processing of your claim may be streamlined.
Medically Unexplained Chronic Multisymptom Illness (MUCMI)
MUCM, formerly known as Gulf War Syndrome, is a classification the VA uses for chronic illnesses that have no clear medical explanation but result in a range of disabling symptoms. MUCMIs include conditions like chronic fatigue syndrome, fibromyalgia, and irritable bowel syndrome (IBS). These conditions are often granted presumptive service connection due to their frequency among veterans of specific deployments, even if the exact cause is unclear.
Nexus Letter
A nexus letter is a medical opinion written by a qualified health professional that links your current condition to your military service. This document is often the key to a successful claim, especially for secondary or complex cases.
The letter must clearly state that it is “at least as likely as not” that the veteran’s condition is related to service, supported by clinical evidence and rationale. Without a strong nexus letter, many otherwise valid claims are denied.
All of these different terms can be daunting, which is why an experienced disability lawyer at Kerr, Robichaux & Caroll is here to walk you through the VA claims process and help secure the benefits you earned and deserve. Does your condition qualify for VA disability benefits? The answer may surprise you. Here are 10 conditions you may not know are eligible.
1. Irritable Bowel Syndrome (IBS)
What Is Irritable Bowel Syndrome?
Irritable Bowel Syndrome (IBS) is a chronic gastrointestinal disorder that affects the large intestine. Common symptoms include abdominal pain, cramping, bloating, gas, and altered bowel habits such as diarrhea, constipation, or both. While the exact cause remains unclear, stress, diet, and certain life events, like military service, can trigger or worsen IBS symptoms.
Establishing a Service Connection for IBS
For a veteran to receive VA disability benefits for IBS, they must show that the condition is service-connected. There are three potential pathways to doing this:
- Direct Service Connection. If IBS was first diagnosed or showed symptoms during active duty, the veteran may qualify for direct service connection. This requires medical records or credible evidence linking the initial onset of symptoms to military service.
- Secondary Service Connection. If IBS developed or worsened due to another service-connected condition (such as PTSD or a traumatic brain injury), it may qualify as a secondary condition. Veterans must show a nexus-a clear medical connection-between the primary condition and IBS.
- Presumptive Service Connection (Gulf War Veterans). Veterans who served in the Southwest Asia Theater of Operations during the Gulf War may qualify for a presumptive service connection under the VA’s rules for Medically Unexplained Chronic Multisymptom Illnesses (MUCMI). IBS is one of the conditions recognized under this policy, meaning eligible veterans do not need to prove a direct link between their service and the condition. This also applies to former prisoners of war (POWs) held for at least 30 days.
VA Disability Ratings for IBS
The VA rates IBS under 38 CFR § 4.114, Diagnostic Code 7319:
- 10% – Moderate symptoms: frequent bowel disturbances and abdominal distress
- 20% – More severe symptoms with increased frequency
- 30% – Severe IBS: near-constant abdominal distress with alternating diarrhea and constipation
Note: 30% is currently the highest possible rating for IBS under the VA’s schedule.
2. Sleep Apnea
Sleep apnea is a serious sleep disorder in which breathing repeatedly stops and starts during sleep. The most common form, obstructive sleep apnea (OSA), occurs when throat muscles relax and block the airway. Symptoms often include loud snoring, gasping for air, daytime fatigue, and difficulty concentrating. For veterans, untreated sleep apnea can severely affect health and daily functioning.
Direct Service Connection
To establish a direct service connection for sleep apnea, veterans must show:
- A current diagnosis of sleep apnea (usually confirmed by a sleep study).
- In-service evidence of symptoms such as documented snoring, choking, or observed breathing pauses reported by fellow service members or noted in medical records.
- A medical nexus linking the current diagnosis to military service.
For example, if a veteran’s medical records during active duty show complaints of fatigue, poor sleep, or snoring-and they now have a confirmed diagnosis of sleep apnea-this can form the basis of a direct claim.
Secondary Service Connection
Sleep apnea may also qualify as a secondary condition if it develops or worsens due to another service-connected disability. Common examples include:
- PTSD, depression, or anxiety, which can disrupt sleep and lead to weight gain.
- Traumatic Brain Injury (TBI), which may alter brain signals involved in breathing during sleep.
- Obesity that results from a service-connected disability.
- Nasal or facial injuries sustained in service that obstruct airflow.
VA Disability Ratings for Sleep Apnea
The VA rates sleep apnea under 38 CFR § 4.97, Diagnostic Code 6847:
- 0% – Asymptomatic but with documented sleep-disordered breathing
- 30% – Persistent daytime hypersomnolence (excessive sleepiness)
- 50% – Requires the use of a CPAP (Continuous Positive Airway Pressure) machine
- 100% – Chronic respiratory failure with carbon dioxide retention, cor pulmonale, or requires tracheostomy
3. Non-PTSD Mental Health Conditions
Direct Service Connection
While PTSD is often highlighted, veterans may also qualify for VA disability benefits for other mental health conditions. These can include depression, anxiety disorders, bipolar disorder, schizophrenia, obsessive-compulsive disorder (OCD), and adjustment disorder, among others. Any of these may be directly linked to military service or develop secondarily due to another service-connected disability.
To establish direct service connection, veterans must show:
- A current diagnosis of a mental health condition.
- An in-service event, stressor, or trauma (such as the death of a fellow service member, sexual trauma, or exposure to combat stress).
- A medical nexus connecting the diagnosis to service.
Example: A veteran who develops depression after the loss of a close friend during service may submit evidence such as a Presidential Memorial Certificate and treatment notes from a mental health provider to establish the connection.
Secondary Service Connection
Mental health conditions often develop as secondary disabilities. For instance:
- Chronic pain from a physical injury may lead to depression.
- Service-connected tinnitus may trigger anxiety.
- A veteran with sleep apnea might develop depression or irritability due to chronic fatigue.
In these cases, the veteran must provide medical evidence that the mental health condition was caused or aggravated by the primary service-connected disability.
Presumptive Service Connections
Sometimes, the VA will automatically assume, or presume, that an applicant’s mental health condition was service-related. For example, depression following a service-related traumatic brain injury (TBI).
VA Mental Health Rating Criteria
Mental health conditions are rated under 38 CFR § 4.130 using the General Rating Formula for Mental Disorders:
- 0% – Diagnosis with no symptoms, or symptoms not severe enough to interfere with work or social functioning
- 10% – Mild symptoms controlled by medication or occasional impairment
- 30% – Occasional decrease in work efficiency; intermittent inability to perform tasks
- 50% – Reduced reliability and productivity; difficulty maintaining work and relationships
- 70% – Deficiencies in most areas (work, family, judgment, mood, thinking)
- 100% – Total occupational and social impairment; unable to function independently
4. Skin Conditions
Skin conditions are among the most common disabilities veterans face, often resulting from service-related exposures, harsh climates, or medical stressors. While some skin issues may seem minor, the VA recognizes that they can significantly impact quality of life, cause pain, or even lead to serious disfigurement.
Direct Service Connection
To secure VA disability compensation for skin conditions directly caused by military service, veterans must prove three things:
- A current medical diagnosis of a skin condition.
- Evidence of an in-service event or exposure that triggered or aggravated the condition (e.g., burns, chemical exposure, extreme sun exposure, or injury).
- A medical nexus linking the current diagnosis to the in-service event.
Examples include rashes caused by chemical burns, chronic fungal infections contracted during deployment or scarring from combat injuries. Additional skin conditions such as athlete’s foot, warts, eczema, and psoriasis can qualify as well.
Presumptive Service Connection
Some skin conditions qualify for presumptive service connection, meaning the VA assumes the link to service without requiring a veteran to prove direct causation.
Agent Orange Exposure
Veterans exposed to Agent Orange may qualify for presumptive service connection if diagnosed with chloracne or other acneform diseases (as long as they appear within one year of exposure).
Exposure is presumed for veterans who served:
- In Vietnam
- Along the Korean DMZ
- On certain Navy ships and aircraft associated with herbicide use
Gulf War Syndrome (Undiagnosed Skin Issues)
Many Gulf War veterans develop chronic or unexplained skin rashes. These may qualify as part of a Medically Unexplained Chronic Multisymptom Illness (MUCMI), recognized under VA’s Gulf War presumptive conditions. Even if the condition does not have a clear medical cause, veterans may still be eligible for benefits if the symptoms are chronic and disabling.
VA Disability Ratings for Skin Conditions
The VA evaluates skin conditions under 38 CFR § 4.118, with ratings depending on the severity, spread, and treatment required.
- 0% – Mild condition, affecting a small area with no ongoing treatment required.
- 10% – Affects <20% of body or exposed areas OR requires intermittent systemic therapy (like corticosteroids).
- 30% – Affects 20-40% of body or exposed areas OR requires systemic therapy for <6 weeks in the past 12 months.
- 60% – Affects >40% of body or exposed areas OR requires systemic therapy for >6 weeks in the past 12 months.
The VA also considers:
- Disfigurement or scarring (especially of the face, neck, or hands)
- Impact on daily life, such as pain, itching, or visible marks that cause psychological distress
Type and frequency of treatment, including whether the condition requires powerful immunosuppressive medications
5. Temporomandibular Joint Disorder (TMJ)
What is TMJ?
Temporomandibular Joint Disorder (TMJ) is a condition affecting the jaw joint and the muscles controlling jaw movement. Symptoms can include jaw pain, limited range of motion, clicking or popping sounds, headaches, and difficulty chewing. TMJ can result from trauma, repetitive stress, or other underlying conditions.
Direct Service Connection
To establish a direct service connection for TMJ, veterans must demonstrate three elements to the VA:
- Current Diagnosis: The veteran must have a current, documented diagnosis of TMJ.
- In-Service Event, Injury, or Illness: The veteran must show that TMJ is related to an event during military service. For example, exposure to an IED blast can cause severe jaw or neck injury, which may lead to TMJ.
- Medical Nexus: A qualified medical professional must provide an opinion stating that it is “at least as likely as not” that the TMJ is connected to the in-service event.
Secondary Service Connection
TMJ can also be connected secondarily to other service-connected conditions. Veterans may be eligible for a secondary service connection if TMJ is caused or worsened by another condition, such as:
- Post-Traumatic Stress Disorder (PTSD) – chronic stress and muscle tension can contribute to jaw dysfunction.
- Bruxism (teeth grinding) – often linked to stress or PTSD, which can exacerbate TMJ symptoms.
VA Rating Criteria for TMJ
The VA rates TMJ under 38 CFR § 4.150, Diagnostic Code 9905 based on jaw inter-incisal range of motion (the distance between upper and lower front teeth when opening the mouth). Only the inter-incisal range or lateral excursion is used for rating-these are not combined.
- 10% – Inter-incisal range limited to 31-40 mm OR lateral excursion limited to 0-4 mm
- 20% – Inter-incisal range limited to 21-30 mm
- 30% – Inter-incisal range limited to 11-20 mm
- 40% – Inter-incisal range limited to 0-10 mm
6. Fibromyalgia
What is Fibromyalgia?
Fibromyalgia is a chronic disorder characterized by widespread musculoskeletal pain, fatigue, sleep disturbances, and cognitive difficulties (sometimes called “fibro fog”). The exact cause is unknown, but it may be triggered by physical injury, infection, or stress.
Direct Service Connection
Veterans may establish direct service connection if they can show that fibromyalgia developed as a result of military service. Common triggers include injury, infection, or stress experienced during active duty. A doctor’s opinion linking fibromyalgia to service is critical.
Secondary Service Connection
Fibromyalgia can also be linked secondarily to other service-connected conditions, including:
- PTSD
- Depression
- Lupus
- Rheumatoid arthritis
- Ankylosing spondylitis
If fibromyalgia develops due to one of these conditions, or if service aggravated pre-existing fibromyalgia, veterans may be eligible for additional VA benefits.
Presumptive Service Connection: Gulf War Veterans
Veterans who served in the Southwest Asia theater (Iraq, Kuwait, Saudi Arabia, Qatar, Bahrain, etc.) on or after August 2, 1990, may qualify for presumptive service connection if:
- They have a fibromyalgia diagnosis.
- The condition is chronic, medically unexplained, and disabling at least 10%.
- Symptoms appeared during active duty or within a certain time after discharge.
VA Rating for Fibromyalgia (DC 5025)
- 40% – Constant or nearly constant symptoms, not improving with treatment.
- 20% – Symptoms present more than 1/3 of the time, often triggered by stress or exertion.
- 10% – Continuous or nearly so but controlled by medication.
7. Meniere’s Disease
What is Meniere’s Disease?
Meniere’s disease is a chronic inner ear disorder that can cause severe episodes of vertigo (spinning dizziness), hearing loss, tinnitus (ringing in the ears), and a feeling of fullness in the ear. For veterans, these symptoms can be disabling, affecting balance, mobility, and the ability to work or perform daily tasks.
Direct Service Connection
You may qualify for direct service connection if Meniere’s disease or recurrent vertigo was diagnosed during active duty, or if service medical records document related symptoms such as dizziness, balance problems, or hearing issues. Supporting evidence can include audiology reports, ENT specialist evaluations, and documentation of treatment while in service.
Secondary Service Connection
Vertigo and balance disorders can also develop as secondary conditions to other service-connected disabilities, including:
- Traumatic Brain Injury (TBI) – Inner ear and vestibular issues often arise after head trauma.
- Hearing loss or tinnitus – Inner ear damage can progress to balance disorders.
- Chronic ear infections or sinus conditions – Long-term ENT problems may trigger or worsen vertigo.
- Medication side effects – Certain service-related medications may affect the inner ear.
VA Rating Criteria for Meniere’s Disease
Meniere’s disease is rated under 38 CFR § 4.87, Diagnostic Code (DC) 6205:
- 30% – Hearing impairment with vertigo less than once a month, with or without tinnitus.
- 60% – Hearing impairment with attacks of vertigo and cerebellar gait occurring one to four times per month, with or without tinnitus.
- 100% – Hearing impairment with attacks of vertigo and cerebellar gait occurring more than once weekly, with or without tinnitus.
If a veteran has only vertigo without full Meniere’s disease, the VA may rate under DC 6204 (Peripheral Vestibular Disorders):
- 10% – Occasional dizziness.
- 30% – Dizziness and occasional staggering.
8. GERD (Gastroesophageal Reflux Disease)
What is GERD?
GERD is a chronic digestive condition where stomach acid flows back into the esophagus, causing heartburn, regurgitation, and discomfort. Many veterans experience GERD due to stress, medications, or other service-connected health issues. If left untreated, GERD can significantly impact overall health and quality of life.
Direct Service Connection
You may qualify for direct service connection if GERD was diagnosed while on active duty and a medical provider supports that it began during service and has continued since. Evidence such as service medical records, prescriptions for antacids or proton-pump inhibitors, and physician statements are critical.
Secondary Service Connection for GERD
GERD is often linked to other service-connected conditions, including:
- PTSD or anxiety – Stress and psychiatric medications can increase acid production.
- Chronic pain conditions – Long-term use of NSAIDs for pain can irritate the stomach.
- Sleep apnea – Research shows a two-way relationship between GERD and obstructive sleep apnea.
VA Rating Criteria for GERD
The VA does not have a diagnostic code solely for GERD. Instead, it is rated by analogy under 38 CFR § 4.114, DC 7346 – Hiatal Hernia:
- 10% – Two or more mild symptoms (pain, vomiting, weight loss, or hematemesis).
- 30% – Persistent epigastric distress with dysphagia (difficulty swallowing), pyrosis (heartburn), regurgitation, and substernal/arm/shoulder pain, with considerable impairment of health.
- 60% – Severe symptoms including pain, vomiting, material weight loss, hematemesis or melena, with moderate anemia, or other serious impairment of health.
9. Migraines
What are Migraines?
Migraines are recurring headaches that can cause severe pain, sensitivity to light or sound, nausea, and visual disturbances. Triggers include stress, head injury, hormonal changes, or neurological conditions.
Direct Service Connection
Veterans can establish direct service connection for migraines by demonstrating:
- Current Diagnosis: A formal diagnosis of migraine headaches.
- In-Service Event or Illness: Examples include concussions, neck injuries, or routine exposure to loud noise.
- Medical Nexus: A qualified medical provider must link the migraines to the in-service event after reviewing both service and medical records.
Secondary Service Connection
Migraines can lead to secondary service-connected conditions. Veterans may qualify for additional VA benefits if they can demonstrate a medical link between migraines and conditions such as:
- Tinnitus: Ringing in the ears due to chronic headaches.
- Hypertension: High blood pressure linked to frequent migraine attacks.
- PTSD: Emotional or mental stress that worsens migraines.
- Depression & Anxiety: Mental health conditions exacerbated by chronic migraines.
Requirements for secondary service connection:
- A formal diagnosis of the secondary condition.
- A medical nexus linking the condition to migraines.
VA Rating Criteria
Migraines are rated under 38 CFR § 4.124a, Diagnostic Code 8100, which evaluates severity, frequency, and the impact on occupational and social functioning.
- 0% – Migraine headaches without significant interference with work or daily activities
- 10% – Occasional, mild, or infrequent migraines that slightly interfere with work or life
- 30% – Prostrating attacks (headaches that require the veteran to lie down) occurring on average once a month over the last several months
- 50% – Very frequent prostrating attacks (more than once a month) that substantially limit work or daily activities
10. Diabetes
What is Diabetes?
Diabetes is a chronic disease where the body either cannot produce enough insulin or cannot effectively use the insulin it produces, leading to high blood sugar levels. Over time, diabetes can cause serious health complications affecting the heart, kidneys, nerves, and eyes.
Direct Service Connection
Veterans may establish a direct service connection by showing that diabetes was incurred or aggravated during military service. Evidence can include:
- Medical records indicating the onset of diabetes symptoms or a diagnosis while in service.
- Exposure to service-related stressors or conditions that contributed to diabetes development.
Obesity may be an intermediate step to a service-connected diabetes diagnosis. For example, if a veteran’s service-connected impairment prevents them from exercising and leads to obesity, which develops into diabetes, then they can qualify for VA benefits for diabetes.
Secondary Service Connection
Type 2 diabetes can cause or worsen other conditions that may qualify for secondary VA disability claims, including:
- Hypertension
- Nerve damage / Peripheral neuropathy
- Diabetic foot or leg amputation
- Cardiovascular disease
- Stroke
Presumptive Service Connection – Agent Orange Exposure
Veterans exposed to Agent Orange or related herbicides may qualify for presumptive service connection for diabetes if they meet service criteria:
- Service in Vietnam, aboard ships in inland waters, or within 12 nautical miles off the coast of Vietnam (Jan 9, 1962 – May 7, 1975).
- Service at certain U.S. or Royal Thai bases, in Laos, Cambodia, Guam, American Samoa, or Johnston Atoll during specified periods.
- Service involving repeated contact with C-123 aircraft, or participation in handling Agent Orange.
VA Rating Criteria for Diabetes
Diabetes Mellitus (DC 7913):
- 100% – Multiple daily insulin injections, restricted diet, regulated activities, episodes of ketoacidosis or hypoglycemia requiring ≥3 hospitalizations/year or weekly care visits, plus severe complications
- 60% – Daily insulin injections, restricted diet, regulated activities, episodes of ketoacidosis or hypoglycemia requiring 1-2 hospitalizations/year or twice monthly visits, plus non-compensable complications
- 40% – Daily insulin injections, restricted diet, regulated activities
- 20% – Daily insulin injections with restricted diet or oral hypoglycemic agent with restricted diet
- 10% – Manageable by diet only
Diabetes Insipidus (DC 7909):
- 30% – First 3 months after initial diagnosis
- 10% – Persistent polyuria or requiring continuous hormonal therapy
About Gulf War Illness (Chronic Multisymptom Illness)
What is Gulf War Illness?
Gulf War Illness is a cluster of chronic, medically unexplained symptoms affecting veterans who served in the Southwest Asia theater. Common symptoms include fatigue, headaches, joint pain, indigestion, insomnia, dizziness, respiratory disorders, and memory problems.
Possible Causes
- Chemical warfare agents (nerve gas, pyridostigmine bromide)
- Environmental exposures (oil well fire smoke, pesticides, depleted uranium, solvents)
- Psychological factors, including PTSD
Gulf War Service Areas
- Bahrain, Iraq, Kuwait, Oman, Qatar, Saudi Arabia, UAE
- Waters of the Persian Gulf, Red Sea, Arabian Sea, and the neutral zone between Iraq and Saudi Arabia
- Airspace above these locations
Veterans of Operation Desert Storm, Desert Shield, New Dawn, Iraqi Freedom, and some Operation Enduring Freedom deployments may qualify under VA Gulf War presumptions.