Nail numbness may be caused by physiological factors, or cervical spondylosis, diabetes and other diseases. 1. Physiological factors: for example, sleeping at night for a long time on the arm, affecting blood circulation, which may cause nail numbness. 2. Cervical spondylosis: when cervical spondylosis gradually aggravate the condition, the pressure to the nerve, easy to cause radiating pain, the symptoms will be involved in the fingers, toes, arms, etc., such as the impact of the limbs of the blood, can cause numbness of the fingertips. 3. Diabetes: when diabetic patients with rapidly rising blood sugar, poor control, easily induced peripheral neuropathy, resulting in numbness of the fingernails. In severe cases, the symptoms may affect the toes, resulting in numbness of the toes. Numbness of the fingernails, in addition to the above factors, should also be considered as a result of carpal tunnel syndrome, chronic alcoholism, metal poisoning, tenosynovitis and other diseases. It is recommended to consult a doctor as soon as possible and analyze the cause of the disease under the guidance of a professional physician before treatment.