Occasional hot flu in the calf may be a sensory abnormality, usually associated with peripheral neuropathy, spinal cord lesions and brain lesions and other factors. 1. Peripheral neuropathy: If the peripheral nervous system is damaged or the nerve function is altered, it may cause sensory abnormalities, and the abnormal reaction will make the patient feel uncomfortable in the legs or limbs, with ants and ants, and there will be a feeling of heat as well as numbness and distension. 2. Spinal cord lesions: such as spinal cord tumors, or inflammation of the spinal cord, easy to cause movement disorders, sensory disorders, so patients will often feel a hot stream in the calf. 3. Brain diseases: such as central neuropathy of the brain, may cause muscle sensory abnormalities, and there will be obvious tremor, heat flu. Occasionally a hot flu in the calf, in addition to the above factors, may also be caused by lumbar disc herniation, these diseases may have similar symptoms occur. It is recommended to consult a doctor in time and standardize the treatment under the guidance of a professional physician.