The common causes of thick fingers are as follows: 1, osteoarthritis: commonly caused by osteoarthritis distal finger joints thick, nodules and other conditions, often occurring in the elderly; 2, rheumatoid arthritis: the patient can appear finger swelling, especially the proximal interphalangeal joints, metacarpophalangeal joints, wrist joints. In addition to thick fingers, patients will also be manifested as morning stiffness, the performance of the morning can not make a fist; 3, trauma: will cause finger coarsening, patients need to go to the hospital in a timely manner to ask specialists to diagnose and treat, do the relevant examination, including blood sedimentation, C-reactive protein, rheumatoid factor, as well as other checks; 4, gouty arthritis: gouty arthritis will appear in the finger thick, the need for checking the blood uric acid content, for the diagnosis of the disease is more helpful. Disease diagnosis is more helpful.