Swelling and pain in the finger joints may be caused by mosquito bites, rheumatoid arthritis, tenosynovitis, etc., and should be treated accordingly for the different causes of this symptom. 1. Mosquito bites: mosquitoes will inject toxins into the fingers when they bite, and under the action of these toxins, the symptoms of swollen and painful finger joints may occur, which can be treated with antihistamines such as cetirizine and loratadine, or glucocorticosteroids such as dexamethasone and prednisone acetate. 2. Rheumatoid arthritis: Rheumatoid arthritis mainly involves the peripheral joints such as finger joints, toe joints and wrist joints, and causes joint swelling, pain and morning stiffness, which needs to be treated with antirheumatic drugs such as salazosulfapyridine and methotrexate, as well as non-steroidal anti-inflammatory drugs such as etoricoxib and indomethacin. 3. Tenosynovitis: tenosynovitis is a double-layered casing-like synovial tube outside the tendon, the tendon sheath of the finger area due to trauma, strain, infection and other causes of inflammation may also appear in the finger joints swollen and painful symptoms, tenosynovitis can be closed treatment, surgical treatment, and diclofenac, naproxen, and other drugs for treatment. All of these medications should be used in accordance with medical advice. There are many reasons for the swelling and pain in finger joints, and it is recommended that patients with persistent or recurrent joint swelling and pain should go to regular hospitals in time and receive standardized treatment under the guidance of doctors.