Protruding bones in the hand may be related to the following reasons: 1. There may be normal bony protrusions. For example, on the back of the hand, it is very easy to see the interphalangeal joints and metacarpophalangeal joints have obvious protrusions. This is due to the metacarpal and phalangeal bones and is normal. This protrusion is especially noticeable in thin patients.2. It may be caused by old injuries. If the patient has previous injuries such as boxer’s fracture, then after the recovery of the fracture may be due to a series of deformities, such as angulation, shortening, lateral displacement, or excessive osteophytes, which will result in the hand in the later stage of the obvious bony protuberance. 3, this case may also be due to the development of congenital factors. That is, due to genetic reasons, there is a bony deformity here. 4, this situation may also be due to the patient has some soft tissue lesions in a certain place, for example, there may be tenosynovitis, tenosynovial cysts and other diseases. During the onset of such diseases, there are obvious localized bumps, and sometimes they are hard, which will make the patient mistakenly think that there are bony protrusions.