Protruding big toe joint of the foot may be caused by trauma, bunion, rheumatoid arthritis and so on. It can be treated with general treatment, physiotherapy, medication and surgery according to the cause. 1. Trauma: Injury to the big toe, such as fracture or dislocation of the joint, may cause bunion protrusion. Rest should be taken after the injury and the affected limb can be elevated at the same time. If the fracture is mildly displaced, it can be immobilized in a plaster or splint; if it is severely displaced, it needs to be surgically cut and repositioned. If the joint is dislocated, it can be fixed with plaster or splint after manipulation. 2. Bunion: Bunion is a deformity of the big toe in the metatarsophalangeal joint, which is shifted to the lateral side of the toe, and can cause the big toe joint to protrude. Usually, loose shoes can be worn and a bunion correction brace can be used. If the pain is severe, non-steroidal anti-inflammatory drugs such as diclofenac sodium can be used. Severe deformity requires surgical treatment, such as metatarsal osteotomy. 3. Rheumatoid arthritis: It is an autoimmune disease characterized by erosive arthritis and mainly affects the joints of the limbs, which can also cause the big toe joint to protrude. Usually pay attention to rest, can apply the above non-steroidal anti-inflammatory drug treatment, can also apply anti-rheumatic drugs, such as methotrexate and other treatment. If the joint is severely deformed, surgery can be performed to correct the deformity and restore the joint function. When the foot thumb joint protrudes, you can go to the hospital to further identify the cause of the disease, and then targeted treatment. The above drugs need to be applied under the guidance of a physician.