The common causes of pain at the base of the right thumb include the following: 1. Acute injury, such as contusion or external force causing pressure smash injury during sports, which can lead to soft tissue injury in mild cases and fracture in severe cases, resulting in corresponding pain. 2. Visible in chronic strain injury, such as prolonged standing, walking or uncomfortable shoes, which can cause a corresponding inflammatory reaction by squeezing the local area for a long time, resulting in pain. 3. The patient will have a painful condition due to the presence of inflammation, such as bunions. 4, visible in gouty arthritis, this joint is also one of the first sites of gouty arthritis, often with local redness, swelling, heat and pain, and the patient will often have increased blood uric acid. It is recommended that patients go to the hospital for a detailed examination to clarify the diagnosis.