PTSD → Obstructive Sleep Apnea

Medical literature basis

Multiple peer-reviewed studies support the link, including research published in Sleep, Journal of Clinical Sleep Medicine, and Chest. Common citations include studies showing elevated OSA prevalence in PTSD cohorts (Yesavage et al., Mysliwiec et al., Williams et al.), and reviews discussing the PTSD → weight-gain → OSA pathway from SSRI and atypical antipsychotic use.

Sample letter

[Provider Letterhead]

Date: March 4, 2026

RE: VA Disability Claim — Secondary Service Connection
Veteran: [Name], DOB: [DOB], SSN: [Last four]

To Whom It May Concern at the Department of Veterans Affairs:

I am Dr. Jane Smith, M.D., board-certified in pulmonary medicine and sleep medicine, licensed in the State of [State], License #[Number]. I have evaluated and treated the above-named veteran since [Date]. This letter sets out my medical opinion on the relationship between the veteran's currently diagnosed obstructive sleep apnea (OSA) and the veteran's service-connected PTSD.

RECORDS REVIEWED

I reviewed the following before forming this opinion:
• Service treatment records, [Date range]
• VA treatment records, [Date range]
• Polysomnography report dated [Date], AHI [number], confirming moderate/severe OSA
• Psychiatric records documenting PTSD diagnosis and treatment, [Date range]
• Medication history including [list psychiatric medications and dates]
• Spouse / lay statement dated [Date]
• Prior VA rating decision dated [Date] granting service connection for PTSD at [%]

CURRENT DIAGNOSIS

The veteran is currently diagnosed with obstructive sleep apnea, confirmed by polysomnography on [Date] showing an apnea-hypopnea index of [AHI value] and meeting diagnostic criteria for OSA.

SERVICE CONNECTION THEORY

This opinion addresses whether the veteran's OSA is secondary to, or aggravated by, the veteran's service-connected PTSD under 38 CFR § 3.310.

MEDICAL OPINION

It is my medical opinion that the veteran's OSA is at least as likely as not (50% probability or greater) caused or aggravated by the veteran's service-connected PTSD.

MEDICAL RATIONALE

The relationship between PTSD and OSA is supported by multiple mechanisms documented in the peer-reviewed literature:

1. Sympathetic arousal and sleep fragmentation. Chronic PTSD is associated with elevated sympathetic nervous system activity that disrupts normal sleep architecture and increases upper airway collapsibility. Studies in Sleep and Journal of Clinical Sleep Medicine have documented elevated OSA prevalence in PTSD cohorts.

2. Medication-related weight gain. The veteran's documented psychiatric medication regimen, including [name medications], is associated with metabolic side effects and weight gain. Weight gain is the strongest modifiable risk factor for OSA. The veteran's documented weight trajectory after starting [medication] supports this pathway.

3. Timeline. The veteran's records show [absence of / minimal] OSA symptoms prior to the documented worsening of the service-connected PTSD. The progression of sleep disturbance, witnessed apneas, and daytime sleepiness aligns with the PTSD trajectory.

4. Absence of alternative explanations. I considered alternative causes including independent obesity (predating PTSD-driven weight gain), structural airway abnormalities, and unrelated sleep disorders. The records support the secondary connection as the most medically reasonable explanation.

Based on the foregoing, my opinion is that the veteran's OSA is at least as likely as not caused and/or aggravated by the service-connected PTSD.

Respectfully submitted,

Dr. Jane Smith, M.D.
Board-Certified Pulmonologist and Sleep Medicine Specialist
License #[Number], State of [State]
[Practice name, address, phone]

Key evidence to attach

• ✓Polysomnography confirming OSA diagnosis (date + AHI)
• ✓PTSD rating decision establishing service-connection
• ✓Psychiatric treatment records covering the period of PTSD progression
• ✓Medication history with weight trajectory data
• ✓Lay statement (spouse / partner) documenting witnessed apneas and snoring patterns

Alternative causes the provider should address

A strong opinion explicitly rules out the obvious alternative explanations. Address each that applies to the veteran:

• ·Pre-existing obesity (rule out as independent cause)
• ·Anatomic airway abnormalities visible on prior imaging
• ·Smoking or alcohol use history
• ·Family history of OSA