Underarm rib pain may be chest wall soft tissue injury, local infection or tumor, intercostal neuralgia and other diseases. 1. Chest wall soft tissue injury: after trauma or collision, there can be chest wall soft tissue injury or rib contusion, which is often manifested as obvious pain, especially when deep breathing, coughing or changing position, the pain is aggravated, and local skin lesions or bruises can be seen. 2. Local infection or tumor: local infection of chest wall or lung tumor will cause pain in axillary ribs because of involving pleura. 3. Intercostal neuralgia: Inflammatory reaction of intercostal nerves caused by various reasons can be manifested as chest pain, which is mostly distributed in the form of a band, and the pain is aggravated when coughing or sneezing. Axillary rib pain can also be seen in other diseases, it is recommended that patients go to the hospital in a timely manner, so as not to delay the condition.