There are two possibilities for numbness in the fingers due to diabetes: 1. Diabetic peripheral neuropathy has occurred, and the lesions can appear bilaterally at the same time. The patient’s numbness symptoms can persist, with hyperalgesia or nociceptive hypersensitivity predominating. On examination there are local abnormalities of pain and temperature sensation. Perfecting the nerve conduction velocity examination of both upper limbs, if there is a slowing of nerve conduction velocity and a decrease in wave amplitude, can help confirm this diagnosis. Treatment should be given B vitamins to nourish the nerves, and drugs specifically for diabetic peripheral neuropathy can also be added, such as epalrestat, and beraprost sodium can be given to improve microcirculation and nerve blood supply. 2. Diabetes causes peripheral vasculopathy, which causes poor peripheral circulation at the end of the limb, leading to numbness. In this case, the nerve conduction velocity check of both upper limbs is normal. The patient’s numbness is mostly episodic, easily appearing during sleep at night, and can improve after daytime activities. Treatment can be done with beriberi sodium to dilate blood vessels and improve microcirculation, with the addition of aspirin, anti-platelet aggregation and reduce blood viscosity, and also with the addition of blood-activating drugs, such as Tiandan Tongluo capsule.