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Pain is the most prominent symptom in OA. Pain with OA is also noted to slowly and insidiously progress with time. Early in the course, the pain is predictable and caused by specific (often high-impact) activities. Over time, pain and other joint symptoms become less predictable and more constant, with daily activities beginning to become affected. In advanced stages, constant dull and aching pain is accompanied by unpredictable, intense, severe pain, which leads to avoidance of certain activities. Other nonpain symptoms of OA include joint swelling, clicking, locking, grating, crepitus, cramping, reduced range of motion, and deformity. Also described are symptoms of instability, buckling, or “giving way.” Patients with OA complain of morning stiffness that improves in 30 minutes. This is unlike in rheumatoid arthritis, which typically last longer. The pain of OA also increases throughout the day and with increased activity.