The causes of painful thumb symptoms are as follows: 1. It may be due to injury to the muscles and ligaments around the thumb or to the soft tissues of the joint capsule of the thumb, resulting in swelling, pain, and restricted movement of the thumb joint. 2. This may lead to infection of the thumb joint, which, in addition to the symptoms of thumb pain, will also lead to local redness, swelling, heat and pain, requiring surgery if necessary. 4. Long-term use of a mouse or cell phone can lead to tenosynovitis of the thumb joint, and the patient will experience pain and limited movement of the thumb joint. When this occurs, rest and physical therapy are required. If there is no relief within a short period of time and the pain increases and affects work and life, surgical treatment may be required to completely relieve the symptoms. Therefore, if there is no relief within a short period of time, it is important to go to a regular hospital to get medical attention and choose a reasonable treatment after the cause is clear.