This document discusses the differences between acute and chronic sports injuries. Acute injuries occur during exercise or sports from an external force, with symptoms like strains, sprains, or fractures. Chronic injuries are overuse injuries that develop over time from repetitive motions in activities like running or tennis. The document provides tips for treating and preventing both acute and chronic injuries, such as resting injuries, seeing a doctor for severe pain, stretching properly, using good form, and warming up before exercise.