Pulling the bar hand pain may be inadequate preparation before exercise, resulting in upper limb upper arm muscle strain, may also be due to improper posture resulting in brachial plexus nerve injury. If the former is not a big problem, just limit the painful limb activity for 24 hours, local cold compresses, and hot compresses including safflower oil massage and massage for 48 hours. If it is a brachial plexus nerve injury, then you need to go to the local tertiary public hospital orthopedic outpatient clinic as soon as possible, treatment includes nerve nutrition, blood circulation, acupuncture rehabilitation, physical therapy rehabilitation treatment.