A finger joint suddenly swollen may be gout, may also be due to trauma, infection, rheumatoid arthritis and other causes, according to their own specific circumstances, through the corresponding examination to make a comprehensive judgment. 1, gout: gout is a disorder of purine metabolism or uric acid excretion disorder caused by the disease, clinical characteristics of blood uric acid elevation, recurrent acute arthritis, gout stone, uric acid kidney stones, etc.. In patients with gout, uric acid is deposited in the joint capsule, cartilage and other tissues, which will stimulate the joints to show joint pain, swelling, redness of the skin and increased skin temperature, and some patients may show the symptoms of one finger joint suddenly swelling. If the patient also has other clinical manifestations of gout, and the blood uric acid is higher than normal, it can be determined that the sudden swelling of a finger joint is caused by gout; 2, other causes: If the patient has a sudden swelling of a finger joint, but no clinical symptoms of gout, and the blood uric acid is at a normal level, it can be basically ruled out that it is caused by gout, the occurrence of the situation may be insect bites, trauma, infection, allergy The condition may be caused by insect bites, trauma, infection, allergy, tenosynovitis, rheumatoid arthritis, angioneurotic edema, bone tumor, etc. For example, a mosquito bite on the finger can cause the venom from the mosquito to enter the body and cause a local inflammatory reaction on the skin, resulting in mild swelling and itchy skin. When patients have trauma to the fingers such as crush injuries, it can cause damage to the soft tissues of the fingers, resulting in inflammatory reactions and vascular damage, which can manifest as swelling or pain in the finger joints.