You are competent to describe what you lived through and what you feel. That makes your personal statement real evidence — lay evidence — and it often supplies the in-service event or the continuity of symptoms the medical file is missing.
Write it in three parts
- What happened in service: the event, injury, or exposure — dates, places, and details you remember.
- What you have felt since: the continuity of symptoms from then to now. This is what proves the condition did not appear out of nowhere.
- How it affects you today: work, sleep, relationships, daily function. Be specific and concrete.
Rules that make it stick
Tell the truth plainly — no exaggeration, no minimizing. Use real examples instead of adjectives (“I wake up three times a night” beats “I sleep badly”). Keep it to what you personally witnessed and experienced. Then submit it on VA Form 21-4138. A tight, honest two pages beats ten pages of venting every time.