If the left arm becomes sore, you should reduce the activities of the arm and, if necessary, the shoulder and neck, and even the head and neck, to prevent the aggravation of pain caused by soft tissue injury in the arm, as well as to prevent the aggravation of soreness in the arm caused by cervical spine disease or shoulder joint disease. In case of soreness, you can take oral horse chestnut seed extract tablets, which can promote blood return to the body, especially the peripheral circulation and venous blood return to the body, so as to reduce the degree of soreness appropriately. It can be taken orally together with ibuprofen extended-release capsule, the symptoms of soreness will be obviously relieved, you can apply topical medication to invigorate blood stasis or simply relieve pain locally.