What Causes Pain at the Base of the Thumb?

There are numerous causes of thumb pain, with the following three being the most common.

1. Gout: Thumb pain is a typical symptom of gout. Gout commonly affects the metatarsophalangeal joint of the big toe (also known as the “bunion joint”), as well as the ankle and knee joints. Therefore, if you experience pain in the thumb joint, prompt medical evaluation is recommended. Acute gout may be accompanied by redness, swelling, and severe pain. Moreover, acute gout attacks often occur suddenly during the night, frequently waking patients from sleep due to intense pain.

2. Rheumatoid Arthritis (RA): Thumb joint pain may also result from rheumatoid arthritis. RA typically affects smaller peripheral joints—such as those in the fingers and toes—rather than larger joints. It is characterized by recurrent episodes, joint swelling and redness, and severe pain. As the disease progresses, it may lead to progressive destruction of articular cartilage and bone, ultimately resulting in joint deformity and functional impairment.

3. De Quervain’s Tenosynovitis: Thumb joint pain can also arise from De Quervain’s tenosynovitis—a condition involving inflammation of the tendons and their surrounding sheaths at the base of the thumb. Patients may experience significant pain and difficulty flexing the thumb. Importantly, this is not a fungal infection but rather an inflammatory condition; symptomatic pharmacotherapy is usually effective.

If such symptoms occur, rest and physical therapy are recommended initially. However, if there is no improvement within a short period, prompt medical consultation is essential to determine the underlying cause and initiate appropriate, targeted treatment.