Distal interphalangeal joint bulge can be caused by joint osteophytes, rheumatoid arthritis, gouty arthritis and other diseases. 1. Joint osteophytes: long-term typing, sewing and other hand work can lead to excessive strain on the joints of the hands, or due to age-related degenerative changes in the joints of the fingers, can lead to osteophytes in the distal interphalangeal joints, which can be manifested as a bulge in the joints. 2. Rheumatoid arthritis: Rheumatoid arthritis involving the distal interphalangeal joints can lead to inflammation of the synovial membrane in the joints, causing damage to the articular cartilage, and the distal interphalangeal joints of the fingers of people with a longer history of the disease can become swollen and deformed. 3. Gouty arthritis: it can be manifested as pain, redness and swelling of the finger joints, and when the finger joints are repeatedly involved and the condition of the attack, it can lead to swelling and protruding deformity of the distal interphalangeal joints. When the distal interphalangeal joints of the fingers protrudes, you should consult a doctor in time, and the specialist will clarify the condition and then actively carry out appropriate treatment, which will help to cure the disease as soon as possible.