The thinning of the root of the finger indicates that it may suffer from localized muscle atrophy, and overwork and malnutrition can also cause such symptoms. 1. Muscle atrophy: localized muscle atrophy of the finger will make the root thin, nerve compression or lesions can cause such diseases, muscle weakness, numbness and other symptoms. 2. Excessive exertion: often carry heavy objects or carry out some physical labor, there will also be the root of the finger thinning, mainly excessive use of the hand affects the blood circulation caused by the adverse symptoms, there will be obvious soreness. 3. Malnutrition: the body’s long-term lack of vitamins and nutrients will appear this kind of bad symptoms, need to go to the hospital for examination, timely supplementation of the body’s needs. When the root of the finger is thinning, you should consult a doctor to choose the right treatment for you, and find out early and treat early.