The caption formula our clinics use

Four lines, in this order, every time. It reads like a person wrote it because a person did.

1. The situation, in the client’s words — “I couldn’t sleep on that shoulder.”
2. What you did about it, plainly, with no clinical jargon.
3. What changed, with a number or a time frame.
4. One small invitation: a question, or where to book.

Keep it under 80 words. Long captions aren’t punished, but they are rarely read, and the fourth line is the one that pays.