Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services or go to an emergency department immediately if you or someone else may have meningitis.
Warning signs include fever with a severe headache, stiff neck, confusion, unusual drowsiness, seizure, or difficulty waking.
Babies need emergency assessment for signs such as poor feeding with unusual sleepiness, a high-pitched cry, marked irritability, a bulging soft spot, seizures, or being unusually floppy or stiff.
Do not wait for a rash or for every typical symptom to appear.
Do not drive yourself if you are confused, severely drowsy, having seizures, or rapidly becoming more unwell.
After leaving hospital, seek urgent medical care for returning fever, worsening headache, repeated vomiting, new weakness, confusion, seizure, fluid leaking from the nose or ear, or increasing difficulty staying awake.
And for anyone, someone who:
Routine follow-up is appropriate for ongoing tiredness, mild concentration problems, hearing concerns, mood changes, or difficulty returning to usual activities when these are stable rather than rapidly worsening.
Every sign above is quoted from the sofidex article on Pneumococcal meningitis. If you are not sure, err upward — it is always reasonable to be checked.