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:
High fever with confusion, severe agitation, or unusual drowsiness
A very fast heartbeat with severe weakness or breathing difficulty
Chest pain, fainting, or signs of a stroke
Sudden severe breathing problems or collapse
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
Seek prompt medical advice if you have known thyrotoxicosis and your symptoms are worsening, your heartbeat is persistently fast or irregular, or you are vomiting and cannot keep medicines down.
If you take an antithyroid medicine, seek same-day advice for fever, severe sore throat, mouth ulcers, yellow skin, dark urine, or marked itching.
These symptoms do not always mean thyroid storm, but they require urgent assessment.
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if you have ongoing palpitations, unexplained weight loss, tremor, heat intolerance, neck swelling, or several other possible thyroid symptoms.
These symptoms have many possible causes, so testing is needed rather than assuming they come from the thyroid.
Every sign above is quoted from the sofidex article on Thyrotoxicosis. If you are not sure, err upward — it is always reasonable to be checked.