Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Call emergency services for symptoms suggesting inflammation of the brain, spinal cord involvement, or another neurological emergency.
These include:
New confusion, unusual behaviour, or difficulty waking
A first seizure or a seizure that does not stop
Sudden muscle weakness or paralysis
Difficulty speaking, swallowing, or breathing
Severe headache with fever, neck stiffness, or reduced alertness
Loss of consciousness
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Do not wait for a mosquito bite mark or a known local outbreak.
The bite may not be visible, and other serious conditions can cause the same symptoms.
During recovery, seek prompt medical advice for worsening weakness, repeated choking, new fever, increasing confusion, or a major decline in mobility.
3
Does any of this apply?
Book an appointment
Stable fatigue, memory problems, tremor, sleep changes, or difficulty managing daily activities can usually be discussed at a routine follow-up appointment.
These symptoms still matter because rehabilitation or practical support may help.
Every sign above is quoted from the sofidex article on West nile encephalitis. If you are not sure, err upward — it is always reasonable to be checked.