What are some common causes of guitar pain and how can it be prevented or alleviated?

Common causes of guitar pain include poor posture, improper technique, and overuse of the hands and fingers. To prevent or alleviate guitar pain, it is important to practice good posture, take breaks during practice sessions, stretch before and after playing, and use proper hand positioning and technique. Additionally, using a guitar with a comfortable neck width and string gauge can also help reduce strain on the hands and fingers.