Symptoms of plantar synovitis are mainly localized pain, especially after prolonged exercise, and may be accompanied by nerve abnormalities. The site of plantar synovitis pain is more fixed, mainly in the heel or the sole of the foot near the heel, and the pain is mainly unilateral. Plantar synovitis can be triggered by prolonged standing, walking, walking on tiptoes, or climbing stairs, and is usually more pronounced in the morning or after standing up suddenly after a long period of rest. Prolonged compression of the soles of the feet may lead to congestion and edema, resulting in aseptic inflammation and the production of inflammatory factors that stimulate the peripheral nerves, leading to pain, swelling and other occurrences. If you suffer from plantar synovitis for a prolonged period of time you should seek medical attention.