Thinning of finger roots may be caused by nutritional deficiencies, diseases and hereditary factors, which require prompt medical attention to find out the causes. 1. Nutritional deficiencies: If the food you eat for a long time is not rich in nutrients, and your own nutritional needs cannot be met, especially the calcium supply is insufficient, this may lead to the body becoming thin and weak, and the root of the fingers will also become thin. Increasing one’s own nutrition and eating a reasonable diet can generally improve such a situation. 2. Diseases: If you suffer from certain diseases, such as uremia, osteoarthrosis, malignant tumors, can lead to sudden thinning of the body, the root of the fingers will also become thin. In this case, the cause of thinning needs to be clarified, and appropriate treatment should be carried out according to the cause of the disease. 3. Genetic factors: Some people have thin fingers due to genetic factors, which do not affect their health and activities and do not need to be treated.