Headache and low fever all the time are mainly seen in the following situations: First, cold: ask the patient whether there is cough, nasal congestion, sore throat, etc., headache all the time and accompanied by fever, you need to consider that there may be a common cold, or influenza, you can go to the hospital to carry out routine blood tests to make it clear. Second, intracranial infection: if there is a constant headache, low fever, accompanied by nausea, vomiting, etc., and some even have mental symptoms, there will be a decline in orientation or cognitive dysfunction, and if there is a convulsion of the limbs or behavioral abnormalities, then it is necessary to carry out a cranial magnetic resonance imaging scanning examination, or enhancement of the examination and lumbar spinal puncture examination, to find out if there is an infection in the cranium. In addition, if the headache and low fever persist, it is also necessary to ask the patient whether there are other parts of the discomfort, and whether there may be other parts of the infection caused by the headache or fever.