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 if you faint, become confused or difficult to wake, have severe weakness, or have signs of severe dehydration with little or no urine.
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 same-day medical care if you have:
Blood in the stool or black, tar-like stool
Severe, worsening, or constant belly pain
Frequent vomiting that prevents you from drinking
A high fever or rapidly worsening illness
Signs of dehydration, such as a very dry mouth, dizziness, or much less urine
Frequent diarrhea during or soon after antibiotic treatment
Seek advice sooner for a baby, an older or frail person, during pregnancy, or if your immune system is weakened.
And for anyone, someone who:
is vomiting and cannot keep fluids down
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if diarrhea is not starting to improve after several days, lasts for weeks, keeps returning, wakes you at night, or comes with unexplained weight loss.
Every sign above is quoted from the sofidex article on Diarrhea. If you are not sure, err upward — it is always reasonable to be checked.