My parents always complain of pains and aches, and yet they don’t seem to like seeing a doctor or a professional to fix the issues they have. I would love to help them out, so could anyone suggest a book that discusses things like bodily pain, bad posture, nerve issues, and muscular issues?

Would love to help them pin-point the exact problems they have. For instance, if a person has a numbness in their big toe, then that means they might have ____ or ____ or ____ as an underlying issue, and should therefore seek _____ or ____ or ____ as a course of diagnosis/treatment.