There are several causes of numbness in the left finger: 1. It may be caused by heart disease, such as heart failure, cardiac insufficiency, coronary artery blockage, tricuspid stenosis, myocarditis, etc., causing insufficient cardiac output, which may lead to peripheral circulation disorders and numbness in the fingers. 2. 3, may also be caused by the patient’s brain disease, when the patient due to meningitis or cerebral edema, brain tissue necrosis, brain atrophy and other reasons, resulting in cortical function is impaired, there will be numbness of the fingers. Patients can go to the hospital for examination and symptomatic treatment, can be appropriate acupuncture or massage to relieve the symptoms of numbness, and if necessary, surgery can be taken.