Tingling in the calves may be a physiological phenomenon, such as due to incorrect sitting posture. It may also be caused by certain diseases, such as cerebrovascular disease, lumbar intervertebral disc herniation and so on. 1. Physiological phenomenon: If the patient likes to stilt legs and keep this posture for a long time, it will lead to poor blood circulation and numbness of the calves. If there is no other physical discomfort, it can be relieved after resting for a period of time. 2. Disease factors (1) Cerebrovascular disease: If the patient suffers from sudden cerebral infarction or cerebral hemorrhage, resulting in damage to brain tissue. This causes dysfunction of the nervous system, resulting in limb sensory impairment. Then there will be numbness in the calf, usually unilateral leg numbness. (1) Lumbar intervertebral disc herniation: If the patient suffers from lumbar intervertebral disc herniation, the diseased tissue will compress the lumbar nerve. It may cause the patient to have abnormal sensation, resulting in numbness in the calf. Usually unilateral numbness of the calf, if the lesion tissue expansion, there may be numbness of both legs. In addition to this, numbness in the calves may also be caused by diseases such as multiple sclerosis and occlusive phlebitis. After a period of rest and observation, if the tingling in the calves is not relieved, please go to the hospital immediately to avoid delaying the condition.