Axillary rib pain is mainly related to local tissue abnormality, and the causes include pleurisy, rib fracture, intercostal neuralgia and lung cancer. 1. Pleurisy: Infectious pleurisy and tuberculous pleurisy are the most common causes, which will cause local pleural irritation and pain in the corresponding areas. 2. Rib fracture: there is a clear history of trauma, and the pain in the corresponding area may be related to the stimulation of the surrounding area after the rib fracture. 3. Intercostal neuralgia: mainly closely related to infection and nerve injury, which will directly cause pain in the corresponding area. 4. Lung cancer: tumors in the lungs may cause damage and stimulate the nerves, causing pain and discomfort in the corresponding area. In addition, strenuous exercise, wind, cold, neurosis and so on can also lead to the manifestation of pain in the corresponding area. If you have underarm rib pain that can not be relieved, you need to consult a doctor in time to diagnose the specific condition and then do standardized treatment.