Muscle injury refers to damage to muscle fibers, often caused by overexertion, trauma, or improper technique during physical activities. Common types of muscle injuries include strains, which occur when muscles are stretched too far, and tears, which can range from mild to severe. Symptoms typically include pain, swelling, and limited movement. Treatment for muscle injuries often involves rest, ice, compression, and elevation, commonly known as the RICE method. In some cases, physical therapy may be recommended to aid recovery and restore strength. Preventive measures, such as proper warm-up and stretching, can help reduce the risk of future injuries.