Intracranial infections can lead to fever and recurrent fever. Intracranial infections include acute septic meningitis, viral meningitis, and tuberculous meningitis. For example, acute septic meningitis has an acute onset, and patients may present with high fever, generalized muscle aches, nausea, vomiting, and severe headache in the early stages, and the headache is severe and gradually worsens, and patients usually have a stiff neck. Patients with tuberculous meningitis will show symptoms such as low-grade fever, night sweats, loss of appetite, and wasting before the onset of the disease. The lesions will also be characterized by full headache and, in severe cases, nausea and vomiting.