Numbness in the fingertips of the left hand may be a sign of peripheral neuritis, cervical spondylosis, diabetic peripheral neuropathy and other diseases. 1. Peripheral neuritis: this disease is usually caused by metabolic diseases, infectious diseases, nerve compression diseases and other reasons, which can lead to damage to peripheral nerves, causing numbness in the fingertips of the left hand, which may also be accompanied by localized swelling, pain, weakness and other symptoms. 2. Cervical spondylosis: due to long-term improper posture, the normal physiological curvature of the cervical spine changes, resulting in local nerve root compression, which can cause numbness of the fingertips of the left hand, accompanied by numbness of the upper limbs, neck and shoulder pain and other symptoms. 3. Diabetic peripheral neuropathy: the disease is a relatively common complication of diabetes, can lead to damage to the patient’s peripheral nerves, resulting in impaired blood circulation in the nerve endings, which may cause numbness of the fingertips of the left hand, may also be accompanied by decreased sensation of the hands, feet, walking unsteady and other symptoms. Numbness of the left fingertips may also be related to other factors, if the symptoms continue to be unrelieved, you should consult a doctor as soon as possible, through the improvement of the relevant examination, to confirm the diagnosis of the cause, and then give targeted treatment.