Pestle finger is characterized by hyperplasia, hypertrophy, and pestle-like enlargement of the end of the finger, which is characterized by a marked widening and thickening of the terminal phalanges, an arch-shaped elevation of the nail from the root to the end, and a basal angle of ≥180 degrees between the skin and the nail at the back of the end of the index finger, which is normally more obtuse at 160 degrees, with the thumb being the most prominent. This obtuse angle is not visible after the occurrence of pestle and mortar, but sometimes shows exactly the opposite angle and an increase in the volume of the terminal finger bones. Pestle finger is a symptom that is most often caused by hypoxia and should be treated for its cause. Most pestle fingers are seen in lung disorders such as bronchopulmonary cancer and metastatic lung tumors, as well as in cardiovascular disease and digestive disorders.