There are several factors for head fever but no fever: 1. From the point of view of Chinese medicine, it is due to endogenous fire, usually fire in the upper jiao, which causes head fever but no fever because of excessive heart fire, liver fire or lung fire. 2. From the point of view of Western medicine, it is due to endocrine and metabolic diseases, such as hyperthyroidism and hyperadrenocorticism, which cause head fever and body fever but not necessarily fever. 3. 3. endocrine disorders, such as female estrogen imbalance around menopause, can also lead to head fever but not fever. 4. patients with extremely low immunity, such as anemia, tuberculosis or blood system diseases, can also have head fever but not fever.