There are many causes of left axillary pain, the specific cause is best to go to the hospital for detailed examination, do not randomly use drugs, which are common mainly as follows: 1, is caused by local lymphatic inflammation caused by fire, resulting in left axillary pain, this situation should pay attention to a light diet, you can take drugs to lower the fire; 2, by inflammatory stimulation or other causes of local neuralgia, this neuralgia has intercostal neuralgia, or neuralgia caused after herpes zoster; 3, caused by local infection, such as pleurisy, pleural tuberculosis and local soft tissue infection and other causes; 4, local rib fracture problems, resulting in left axillary pain, bone metastases can also appear; 5, the chest mediastinum and tumors in the neck and other reasons, will also cause left axillary pain; 6, cervical spondylosis, osteoporosis and thoracic spinal hyperplasia and other degenerative diseases can also cause pain.