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
Get emergency help for:
Sudden or severe abdominal pain
Upper-left abdominal pain after a fall, collision, or blow
Pain with fainting, severe dizziness, weakness, or clammy skin
Severe breathing difficulty or rapidly worsening swelling
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 advice for new or worsening abdominal pain with fever, repeated vomiting, yellow skin or eyes, dark urine, or marked abdominal swelling.
These features may need prompt assessment but do not always mean there is a serious cause.
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if you have persistent upper-abdominal fullness, unexplained swelling, early fullness with meals, or a lump beneath your ribs.
You should also follow up if an enlarged organ was found on a scan, even if you feel well.
The article also says
If you know your spleen is enlarged, avoid contact sports and activities that could cause a blow to your abdomen until a clinician says they are safe.
Every sign above is quoted from the sofidex article on Visceromegaly. If you are not sure, err upward — it is always reasonable to be checked.