Infections of the head can be caused by viruses, bacteria, fungi, or, occasionally, protozoa or parasites. Infections of the head often also involve other parts of the central nervous system, including the spinal cord. The brain and spinal cord are usually protected from infection, but when they become infected, the consequences are often very serious. Causes of head infection are fungi, protozoa, and parasites. Symptoms of head infection are fever, severe headache, stiff neck, nausea, vomiting, and discomfort when looking into a bright light, sleepiness, and confusion. Head infection is treated by neurologists and Neurosurgeon.