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Arthritis or another medical condition could be the cause of a stiff knee. Overuse of the joints and muscles in your knee can also cause stiffness. Strengthening your hamstrings, quadriceps and other knee-supporting muscles protects your knees from stress and the shock of impact, according to American Academy of Orthopaedic Surgeons. Stretching your muscles improves flexibility, which can prevent stiffness and injury.
Because knee pain has so many different causes, there is no single treatment that can help bring relief. However, there are several options your doctor may suggest. Rest your knee. If your pain is the result of an injury or overuse, the doctor may ask you to rest your knee for a period of days or weeks. This will help inflamed areas return to normal so that your pain will subside. Ice your knee. Similar to resting, ice can help swelling subside and hasten healing from certain injuries.