Male patients with left axillary pain have the following common clinical causes: a. Long-term smoking can induce the formation of malignant tumors in the left lung. Once the malignant tumor invades the chest wall of the left axilla, it will cause local radiological pain with cough and sputum. The specific location of the lesion can be clarified by perfecting CT enhancement examination of the lung, and it is necessary to perform radical treatment of the malignant tumor and clear the lymph nodes as soon as possible, which can often achieve better therapeutic effect after surgery. When the patient’s left axillary skin is accompanied by folliculitis, it can also cause local obvious swelling and pain. It can be done by applying topical Ruyi Jinhuang cream or 0.5% vital iodine gauze to promote local inflammation to absorb and subside faster so as to improve the pain symptoms. Thirdly, if the patient accidentally strains the left axillary muscle during fitness or exercise, local swelling, pain and restricted activity can also occur. The local pain symptoms can be alleviated by applying blood-stasis ointment externally and taking bruising pills and swelling pain pills orally.