There are many reasons for tingling in the thumb, such as acute trauma, tenosynovitis, rheumatoid arthritis, etc. can cause tingling in the thumb. 1. Acute trauma: fingers often do all kinds of sports, it is easy to suffer from external injuries, which leads to thumb injuries, thus causing pain. 2. Tenosynovitis: Workers who have been engaged in hand labor for a long time, such as typists, bank clerks, etc., are likely to suffer from joint strain, due to repeated friction of the tendons, which results in the formation of stenosing tenosynovitis of the thumb. 3. Rheumatoid arthritis: Rheumatoid arthritis causes tingling in the thumb may be due to an inflammatory reaction that causes persistent synovitis symptoms, which in turn leads to the destruction of articular cartilage. The disease is most often seen in the small joints of the fingers and is characterized by morning stiffness, impaired mobility, and pain. If the symptoms persist, worsen or are combined, you need to go to the hospital for examination to clarify the cause of the disease.