Tenosynovitis is a common problem that causes severe pain in the hand and forearm area. Specifically, the pain can be located on the inner side of the wrist and the forearm region near a person's thumb. The primary cause of tenosynovitis is inflammation of the two tendons in the thumbs, which causes pain in the thumb and wrist area. Tenosynovitis is a very common problem and usually fairly easy to diagnose.

People who develop tenosynovitis usually use their hands and thumbs in the same repeated motion several times a day. Some of the motions that lead to the development of tenosynovitis are continual pinching, grasping objects repeatedly, squeezing things, or performing a regular wringing motion with the hands and wrists. People who have been diagnosed with rheumatoid arthritis can also develop tenosynovitis.

Symptoms of tenosynovitis include constant soreness in the thumb and wrist area. Over time, if the problem is not treated, the pain can spread further up the wrist and possibly all the way into the thumb. Ultimately, untreated tenosynovitis can make it difficult and almost impossible for the person to pinch, grasp, squeeze, or wring anything without experiencing severe pain. In addition, the pain will worsen over time if nothing is done to alleviate it.

A doctor should be able to easily diagnose tenosynovitis by evaluating a person's hand, fingers, and wrist. The physical tests a doctor performs to diagnose tenosynovitis generally involve simply holding the thumb, manipulating it in different directions, and listening to the patient's feedback. Many times, the symptoms of tenosynovitis improve without treatment if the aggravating motion is discontinued. In some cases, wearing a splint can also help it heal. In the most severe cases, anti-inflammatory medications, cortisone injections, physical therapy, or surgery may also be part of the treatment and recovery process.