Pestle finger tends to take a long time to form, and it is not generalized, as it depends on the individual’s constitution and the severity of the lesion. In general, the more severe the disease, the earlier it appears. Pestle finger refers to the hypertrophy of the end of the fingers or toes, the nail from the root to the end of the bulge, in the shape of a pestle, and its mechanism of occurrence and the end of the limb chronic hypoxia, metabolic disorders and poisoning. The mechanism is related to chronic hypoxia, metabolic disorders, and intoxication. When hypoxia occurs, capillary proliferation and dilatation of the end of the limb, and soft tissue hyperplasia will lead to end enlargement. The main diseases that cause pestle and mortar fingers are bronchiectasis, lung cancer, and certain congenital heart diseases. In addition, some nutritional disorders such as cirrhosis of the liver may also occur. When you notice any abnormality in your nails or any uncomfortable symptoms in your body, you should seek medical attention without delay.