Forehead fever with headache, the causes include central nervous system infectious diseases, vascular headache, as follows: 1. Central nervous system infectious diseases: including viral infections, bacterial infections, fungal infections, and other rare pathogenic infections, can cause fever with headache. The cause of headache is usually inflammatory stimulation of the meninges, and there are obvious signs of high cranial pressure, and physical examination is often positive for cervical ankylosis, Kirschner’s sign and Bruch’s sign, and lumbar puncture examination can help to make a clear diagnosis; 2. Vascular headache: fever can induce vascular headache, and such patients have a history of similar diseases in the past. The CT examination was abnormal and the meningeal stimulation sign was also negative.