If you feel that your hands and feet are not hot but your hair is hot, you can take your body temperature first. If your body temperature is normal, it should be caused by relatively cold hands and feet. In addition, the common pathological causes of this condition include brain infection, endocrine disorders, other brain diseases and immune system diseases. 1. Brain infection: when brain infection occurs, under the stimulation of inflammatory cells and pathogenic microorganisms, the blood vessels in the brain will dilate, resulting in an increase in blood flow to the brain, but hands and feet without inflammation will not be warm. 2. Endocrine disorders: endocrine disorders such as hyperthyroidism, hyperadrenocorticism and imbalance of estrogen and progesterone secretion can lead to fever because of abnormal secretion of thyroid hormone, adrenal hormone or estrogen and progesterone. 3. Other brain diseases: brain diseases such as impaired function of heat-sensitive neurons and vegetative nerve dysfunction may cause abnormalities in the head temperature regulation center, resulting in hot head but not hot hands and feet. 4. Immune system diseases: including rheumatoid arthritis, connective tissue disease, leukemia and other immune system diseases can also cause the phenomenon of hot hands and feet but hot hair. The hands and feet are not hot but the hair is hot patients, it is recommended to go to the regular hospital to identify the cause of the disease, and by professional doctors to implement targeted treatment.