A hard lump on the root joint of the middle finger may be caused by stenosing tenosynovitis, tenosynovial cyst, joint degeneration, etc.
1. Stenosing tenosynovitis: It may be caused by excessive movement of the finger joints or long-term friction and irritation. A common case is stenosing tenosynovitis of the flexor tendon of the middle finger, which can easily lead to a hard lump on the root joint of the middle finger.
2. Tendon sheath cysts: may be due to long-term chronic strain, pathogen infection, inflammatory stimuli and other factors, resulting in joint capsule, tendon sheath and other connective tissue malnutrition, thus appearing joint degenerative cysts. Tendon sheath cysts in the root joint of the middle finger can easily lead to the phenomenon of a hard lump.
3. Joint degeneration: joints can age and degenerate due to a variety of factors, causing joint ligament laxity, osteophytes and other conditions, resulting in degenerative joint lesions. A hard lump on the joint of the root of the middle finger is due to the degenerative lesion of the joint of the root of the middle finger, causing osteophytes.
There may be other causes for the hard lump on the joint of the root of the middle finger, which may also be sebaceous cysts, lipomas and corpus callosum, etc. It is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.