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
These symptoms need timely assessment but are not always an emergency.
Seek emergency care for:
A sudden, severe headache, especially with vomiting
Sudden loss or marked worsening of vision
Fainting, severe confusion, unusual drowsiness, or collapse
Severe weakness with low blood pressure or repeated vomiting
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
Contact the pituitary or endocrine team promptly for new or worsening headaches, double vision, loss of side vision, repeated vomiting, or major changes in thirst and urination.
This requires urgent hospital assessment.
3
Does any of this apply?
Book an appointment
Arrange a routine medical appointment if a child or teenager is growing much faster than expected, has rapidly increasing shoe or hand size, or develops several features such as headaches, heavy sweating, facial changes, or delayed puberty.
Bring previous growth measurements if they are available.
The article also says
A sudden headache with visual or neurological symptoms can rarely mean bleeding into a pituitary tumor, called pituitary apoplexy.
Every sign above is quoted from the sofidex article on Gigantism. If you are not sure, err upward — it is always reasonable to be checked.