Common causes of pain in the little finger include trauma to the little finger, tenosynovitis and lateral collateral ligament injury. 1. Trauma to the little finger: If the little finger is traumatized due to over exertion, bumping against hard objects and razor blade cuts, etc., the muscles, blood vessels, nerves, ligaments and other tissues of the little finger are damaged, which can lead to pain in the little finger. 2. Tenosynovitis: the main causative factor of tenosynovitis is chronic strain, when the tendons and tendon sheaths of the little finger are overly friction, so that the tendon sheath tissues are edematous and even produce an inflammatory reaction, then the patient will have localized pain in the little finger, limited joint activities and other clinical manifestations. 3. Lateral collateral ligament injury: If the lateral collateral ligament of the little finger is damaged by external impact, carrying heavy objects, etc., resulting in joint instability and local blood vessel rupture, swelling and pain in the little finger can occur. If the pain in the little finger needs to consult a doctor in time, the professional doctor to clarify the cause of the disease, to develop individualized diagnosis and treatment plan.