The thumping of the arm joints may be caused by physiological popping, osteoarthritis, tenosynovitis and so on. 1. Physiological popping: arm joint thumping may be physiological popping, usually only sound, will not lead to joint pain, soreness or limited activities, mainly is the friction between the articular cartilage and synovial membrane and movement, or tendons around the joints in the tendon sheath of the movement of the sound, is a normal phenomenon. 2. Osteoarthritis: when the articular cartilage degeneration, degeneration, wear and tear, disappearance, and accompanied by the joint capsule, peripheral ligament degeneration, fibrosis, etc., the patient will appear arm joints thumping, serious patients will be completely destroyed, deformity of the joint surfaces, after resting temporary stiffness, friction pain in the joints as well as crunching sound. 3. Tenosynovitis: due to frequent activities in daily life, caused by excessive friction, increasing the mechanical friction of tendons and tendon sheaths, which leads to the phenomenon of thumping of arm joints. If accompanied by pain and discomfort, it is recommended that patients go to the hospital in a timely manner, under the diagnosis of the doctor, according to the patient’s specific condition, to take targeted treatment.