A body temperature of 37℃ but headache means that there is no fever symptom yet, and infection can be basically ruled out, because infection will lead to a significant increase in body temperature. Exertion, cold, heatstroke, trauma and some disease factors can cause headache, if the headache is severe or has other accompanying symptoms, it is recommended that patients should seek medical attention in a timely manner, and need to combine blood routine, cerebrospinal fluid, cranial CT and other clear diagnosis: 1. Head trauma: head trauma can have signs of subcutaneous hematoma skull fracture or intradural or extradural hematoma, or induce intracranial hemangioma, cerebral embolism, hypertension, etc. resulting in cerebral vascular rupture that causes intracerebral hemorrhage, causing obvious headache and a body temperature of 37℃; 2. Primary neurological headache: patients can have recurrent attacks, attention cannot be focused due to pain, often accompanied by dizziness, insomnia, irritability and other manifestations, usually able to improve within 1-2 days, commonly due to exertion, lack of sleep, mental depression, etc.; 3. Cold: if the pain is new recently, and the body temperature is 37℃, it belongs to the normal within the range of body temperature, it may be due to the symptoms of cold caused by cold; 4, heat stroke: if the weather is hot and the environment is dry, it may also cause the patient to suffer from heat stroke, which is manifested as dryness, headache, moodiness, and a body temperature of 37℃; 5, glaucoma: the patient’s body temperature of 37℃ and the presence of headache may be caused by the progression of glaucoma. Generally patients gradually appear blurred vision, eye swelling and headache symptoms, and in severe cases, the increase in intraocular pressure will lead to headache and vomiting; 6, hypotension: because hypotension will cause the body’s blood volume to decrease, the emergence of abnormal blood supply to the brain may cause hypoxia in the brain, and then hypoxic small arteries will spasm, vascular spasm can cause headache, but the body temperature 37 ℃; 7, cerebrovascular disease: such as cerebral infarction, arterial Atherosclerosis and other cerebrovascular diseases mostly cause headaches due to malformation or blockage of blood vessels in the brain, resulting in insufficient oxygen and blood supply to the brain. Cerebrovascular diseases do not affect the body temperature, so the body temperature of 37 ℃ but headache may be caused by cerebrovascular diseases.