Bone bulge on the root of the right thumb can be caused by tenosynovitis, which is also a symptom of many diseases, such as gout, osteophytes and other factors, you should consult a doctor in time to find out the cause of the disease. 1. Tenosynovitis: mostly caused by factors such as prolonged repetitive movements or continuous exertion, leading to inflammatory infiltration around the tendon sheath and the formation of aseptic inflammation, which, with the development of the disease, can form the symptom of the bulging bone on the root of the right thumb. 2. Gout: caused by excessive intake of purine-rich foods or uric acid excretion disorder, resulting in high uric acid value in the body, uric acid deposition in the thumb, the formation of uric acid crystals precipitation, the symptoms of the bone on the root of the right thumb can appear. 3. Bone hyperplasia: mostly due to trauma or long-term wear and tear and other factors, resulting in localized bone hyperplasia at the root of the thumb, which can cause the symptoms of bulging bones on the root of the right thumb. If you have symptoms of a bulging bone on the right thumb, you should go to the hospital in time to find out the cause of the problem and take targeted treatment. In your daily life, you should avoid prolonged fixed repetitive movements and combine work and rest.