Pestle finger can be caused by chronic lung diseases, cardiovascular diseases, digestive system diseases, etc. It is recommended to consult a doctor in time. 1. Chronic lung diseases: such as bronchiectasis, tuberculosis, chronic bronchitis, silicosis, emphysema, diffuse interstitial fibrosis, tuberculosis, etc., the patient may also be accompanied by long-term or recurrent coughing, coughing up sputum, hemoptysis and other discomforts. 2. Cardiovascular diseases: such as subacute infective endocarditis, pulmonary arteriovenous fistula, cyanosis congenital heart disease, chronic pulmonary heart disease, etc., patients may also be accompanied by palpitations, chest tightness, shortness of breath, decreased activity tolerance and other discomforts. 3. Digestive system diseases: such as liver cirrhosis, intestinal tuberculosis, chronic dysentery, colonic polyps, pyloric carcinoma, etc., patients may also be accompanied by decreased appetite, emaciation, nausea, abdominal distension, jaundice and other discomforts. 4. Others: e.g. hyperthyroidism, chronic pyelonephritis, hypertrophic osteoarthropathy, spinal cord cavernous disease. Patients with symptoms of mortar and pestle finger should consult a doctor in time to identify the cause of the disease and treatment under the guidance of the doctor, and should not make blind judgment on their own in order to avoid delaying the condition.