Plantar numbness is mainly seen in peripheral neuropathy, subacute joint degeneration, lumbar spine lesions, as follows: First, peripheral neuropathy: seen in peripheral neuropathy, such as patients with diabetes, and there is a bilateral or one side of the plantar numbness, to consider the possibility of diabetes-induced peripheral neuropathy, you can perform electromyography. The main treatment is to control the blood sugar, and at the same time give the treatment of nerve nutrition. Second, subacute joint degeneration: ask the patient if there is any past history of chronic gastritis or gastric surgery, and if there is any weakness of both lower limbs, accompanied by unstable walking, walking on cotton-like sensation, subacute joint degeneration should be considered, and blood can be drawn for vitamin B12, homocysteine, lumbar puncture, electromyography, and magnetic resonance examination of the head and cervical spine. Treatment is given to nerve nutrition, such as vitamin B12, folic acid and other treatments. Third, lumbar spine lesions: If the numbness is unilateral plantar, also consider whether the patient has lumbar spine lesions, you can carry out lumbar spine magnetic resonance examination to understand whether there are lesions in the lumbosacral region, treatment is mainly given to nerve-nourishing drugs, such as vitamin B1, vitamin B12 and other symptomatic treatment.