Knee pain refers to any discomfort or soreness experienced in the knee joint or surrounding areas. It can be caused by a variety of factors, including injury, overuse, arthritis, gout, bursitis, tendonitis, and other medical conditions. The severity of knee pain can vary from mild to severe, and it may limit mobility and daily activities. Treatment for knee pain depends on the underlying cause and may include rest, ice or heat application, medication, physical therapy, or surgery in some cases.