A hard bump on the finger joint that hurts when pressed may be caused by tendon sheath cysts, stenosing tenosynovitis, rheumatoid arthritis and other diseases, which should be treated with oral medication, surgery and topical medication under the guidance of a doctor. 1. Tendon sheath cysts: Tendon sheath cysts belong to a kind of cystic lesion, which may be related to trauma, strain injury and joint degeneration, resulting in a raised hard bag in the finger joints that hurts when pressed, and can be treated with oral non-steroidal anti-inflammatory drugs under the guidance of the doctor, such as Celecoxib capsules, diclofenac sodium extended-release tablets, and so on. 2. Stenosing tenosynovitis: a sterile inflammation caused by repeated abrasion and pulling of the tendon sheath, which can be touched locally as hard nodules or small lumps. Pressure pain and pulling pain of the tendon sheath after activity may occur. Under the guidance of the doctor, it can be treated by injection of tretinoin for closure. When the condition is serious, it needs to be treated by surgery, such as knife, partial resection of tendon sheath. 3. Rheumatoid arthritis: Rheumatoid arthritis will involve the finger joints, resulting in swelling and deformation of the joints, and the finger joints will be swollen and painful when pressed. Under the guidance of the doctor can be adjusted through anti-inflammatory immunotherapy, such as methotrexate, celecoxib and so on. Patients with a raised hard bag in the finger joints that hurts when pressed are advised to seek prompt medical attention to identify the cause of the problem with the help of a doctor, and to carry out targeted treatment or therapy.