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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.
Rest your knee. As much as possible, try to avoid activities that make the pain worse, such as running, squatting, lunging, or sitting and standing for long periods of time. Ice your knee to ease pain and swelling. Do it for 20-30 minutes every 3-4 hours for 2-3 days, or until the pain is gone.