Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Suspected bacterial meningitis is an emergency.
Call emergency services or go to an emergency department immediately if someone has fever with a severe headache, stiff neck, confusion, unusual drowsiness, a seizure, or difficulty waking.
Emergency help is also needed for breathing difficulty, blue or grey skin, rapidly worsening weakness, collapse, or signs of severe bloodstream infection such as cold mottled skin and reduced responsiveness.
A baby needs urgent assessment for fever with poor feeding, unusual sleepiness, persistent irritability, a bulging soft spot, a high-pitched cry, floppiness, or unusual stiffness.
Do not wait for every typical symptom to appear.
After discharge, seek urgent medical advice for a new fever, worsening headache, repeated vomiting, increasing confusion, a seizure, new weakness, or clear deterioration.
And for anyone, someone who:
Arrange routine follow-up for persistent tiredness, headaches, hearing concerns, concentration problems, or changes in a child’s speech, learning, movement, or behaviour.
Every sign above is quoted from the sofidex article on H influenzae meningitis. If you are not sure, err upward — it is always reasonable to be checked.