When diabetic patients have poor long-term blood sugar control, they are prone to a variety of chronic complications, such as diabetic vasculopathy, neuropathy, fundopathy, diabetic nephropathy, etc. The causes of diabetic hand and foot numbness are the following possibilities: 1, diabetic peripheral neuropathy, when diabetic patients with peripheral neuropathy, can appear numbness, swelling and pain in the limbs, or wear gloves sock-like feeling, diabetic peripheral neuropathy is the most common cause of numbness in the hands and feet of diabetic patients. 2, cervical spondylosis, lumbar disc herniation, etc., when the patient combined with cervical spondylosis, lumbar disc herniation compression of nerves, can appear numbness in the hands and feet. 3, cerebrovascular disease, when diabetic patients combined with cerebral insufficiency of blood supply or even cerebral infarction, can also appear the symptoms of numbness in the hands and feet. 4, a few patients combined with carpal tunnel syndrome, compression of the median nerve can also appear numbness of the hands.