The symptoms of numbness and swelling in the right arm may be related to poor blood circulation caused by prolonged lifting of the right arm, doing certain exercises or working. It may also be related to shoulder joint problems or cervical spine problems. If you often have pain in the neck and shoulder, or if the pain is significantly aggravated when you lower your head for too long, you can have a cervical spine CT examination, and you can also do local massage and hot compresses to help relieve the symptoms. If one side of the arm is numb and swollen, if the lower limbs also feel weak, sore and numb, or if there are frequent headaches, drowsiness, and mental discomfort, it may be related to lacunar cerebral infarction, cerebral blood supply deficiency, etc. Peripheral neuritis or local nerve injury, cold, diabetes, hypertension, etc., may also lead to numbness and swelling in one arm.