Possible causes of numbness in the lower legs and feet below the knee include cerebrovascular disease, lumbar disc herniation and peripheral neuritis, which need to be treated according to the specific disease. 1. Cerebrovascular disease. Cerebrovascular disease, such as cerebral ischemia, often due to the dysfunction of the sensory center, resulting in one side of the limb of the upper limb or lower limb sensory abnormalities, such as numbness and so on. Therefore, when one side of the lower leg and foot numbness need to be alert to the existence of brain lesions, feasible cranial magnetic resonance examination to clarify. Treatment should actively deal with the primary disease to alleviate the corresponding symptoms. 2. Lumbar disc herniation. Lumbar disc herniation may lead to numbness in the calves and feet when the relevant nerves are compressed, which can be clarified by combining the corresponding medical history with the results of lumbar magnetic resonance examination. Conservative treatment is preferred for mild cases, such as daily exercise and massage therapy, while surgery is preferred for severe cases to effectively relieve symptoms. 3. Peripheral neuritis. Peripheral neuritis is characterized by abnormal movement and sensation of the distal ends of the hands and feet. Numbness of the lower legs and feet may also indicate this disease, which can be diagnosed by combining with relevant medical history, such as diabetes mellitus. Treatment is based on active control of the primary disease, such as active regulation of blood glucose and nerve nutrition. There are many possible causes of numbness in the legs and feet below the knee, so it is recommended to consult a doctor in time and complete the appropriate examinations under the guidance of a medical professional to identify the cause of the disease, and then choose a treatment plan according to the specific cause. When doing related exercises, you should accept the guidance of professionals.