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If you are seeking service connection for sleep apnea secondary to PTSD, the right mix of medical records, lay evidence, and physician rationale matters. This guide explains the common evidence pathways, what to submit with your claim, how to prepare for the C&P exam, sample language a doctor may use in a nexus letter, and mistakes that often lead to avoidable denials.

Confused about DBQ, nexus letter, and IMO? This guide breaks down what each document is, who writes it, when to use it, and how to layer them for the strongest possible VA claim. You will get quick definitions, side by side use cases, common pitfalls, and a step by step plan to decide which one you need right now. Examples highlight direct, secondary, and aggravation claims and show when a simple DBQ is enough versus when a full IMO with record review makes sense.

A clear buddy statement can fill gaps when records are thin. This guide explains what a buddy statement is, when it helps most, who should write it, exactly what to include, and how to submit it with VA Form 21-10210. You also get a short template, a quality checklist, and tips to combine lay evidence with a nexus letter and other records for a stronger claim.

A nexus letter is a medical opinion that connects your current diagnosis to your military service. This guide explains what a nexus letter is, when it helps most, what it must include, the evidence to gather, and the steps to request one so your VA disability claim presents a clear, credible line from service to today.