Soreness and pain in the arm is due to many reasons, which may be related to excessive exercise, upper extremity venous thrombosis, cervical spondylosis and so on. 1. Excessive exercise: after sudden excessive exercise of the upper limbs, the muscles of the arm can not be relaxed, which will cause lactic acid and other local metabolic waste to accumulate more, thus causing soreness. 2. Upper extremity venous thrombosis: when venous thrombosis occurs in the upper extremity, it can lead to obvious obstruction of venous blood return, and a large amount of blood can be deposited in the distal end of the arm, thus causing localized soreness. 3. Cervical spondylosis: degenerative changes in the cervical vertebrae lead to compression of the cervical nerve roots, and the phenomenon of arm soreness and distension occurs along the course and innervation area of the affected nerve roots. When the arm soreness and swelling pain, it is recommended to consult a doctor in time, follow the doctor’s instructions for further examination, with the help of the doctor to clarify the cause, and targeted treatment or treatment.