Pestle finger is characterized by hyperplasia and hypertrophy at the end of the finger, with a pestle-like enlargement, which is characterized by a marked widening and thickening of the terminal phalanges, an arching of the nail from root to end, and a basal angle of ≥180 degrees between the skin and the nail at the dorsal surface of the tip of the index finger, compared with the normal obtuse angle of 160 degrees, which is the most pronounced in the thumb. This obtuse angle is not visible with the development of mortar and pestle finger, which sometimes presents with the exact opposite angle and an increase in the volume of the terminal phalanx. Pestle finger is a symptom that is most often due to oxygen deprivation and should be treated for its cause. Most cases of mortar and pestle fingers are seen in lung diseases such as bronchopulmonary cancer and metastatic lung tumors, but also in cardiovascular and digestive diseases.