Almost all adults present with at least 2 of the following:
Headache
Fever
Neck stiffness
Altered Mental Status
Other nonspecific symptoms include:
Photophobia
Vomiting
Prodromal URI
Focal neuro symptoms (e.g. CN deficit)
Seizures
Meningitis
Migraine headache
Encephalitis
Tension headache
Meningoencephalitis
Cluster headache
Neoplastic meningitis
Meningitis/encephalitis