There are many causes of pestle finger, such as bronchiectasis, congenital heart disease, ulcerative colitis and heredity. Pestle finger is due to the lack of oxygen at the end of the circulation, under the action of vasoactive substances such as bradykinin, local vasodilatation, increased blood flow, connective tissue hyperplasia, soft tissue hypertrophy resulting in the end of the finger dilated, mostly accompanied by symptoms of the original disease. 1. Bronchial dilatation: fever, chronic cough, large amount of purulent sputum, recurrent hemoptysis and other symptoms, according to the history and signs, combined with chest X-ray or CT examination, can be diagnosed. 2. Congenital heart disease: backwardness, weakness, palpitation and shortness of breath after activity, some patients may have pestle finger, which can be diagnosed by combining with cardiac ultrasonography. 3. Ulcerative colitis: persistent or recurrent diarrhea, accompanied by abdominal pain, abdominal distension, nausea and vomiting, mucus, pus and blood stools, etc. Endoscopic examination reveals that the colonic mucosa shows multiple shallow ulcers, accompanied by congestion and edema. 4. Heredity: it can be found in the family’s offspring and is mostly chromosomally dominant. Pestle finger may have other causes, such as bacterial endocarditis, chronic lung abscess, chronic obstructive pulmonary disease, lung tumors, etc., so pestle finger, should be timely hospital consultation, improve the relevant examination to clarify the cause.