Bent nails do not necessarily mean crooked nails. Nail curvature may be related to trauma, or nail bed injury. Pestle finger is characterized by an abnormally enlarged deformity at the end of the finger, which is not simply a curved nail and requires prompt medical attention to identify the cause of the problem. The general clinical manifestation of pestle finger is that the end of the finger is enlarged like a mallet, especially the end of the finger is the most obvious, the nail from the root to the end of the arch-shaped bulge, which can be manifested as a curved fingernail, in the shape of an arch bridge, you need to consult a doctor in time, improve the relevant examination, a clear diagnosis. Pestle-like finger is usually a sign of prolonged hypoxia, resulting in vascular hyperplasia at the end of the finger, which is most common in lung diseases, such as chronic obstructive pulmonary disease, lung abscess, and branchial dilatation, etc., and can also be seen in cardiovascular diseases, such as infective endocarditis, etc.. The primary cause of pestle finger needs to be detected and treated as early as possible.