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
Seek emergency help for:
Severe difficulty breathing, chest pain, fainting, or new confusion
Heavy or uncontrolled bleeding
Rapid swelling of the face or neck, especially with breathing trouble
Signs of a severe allergic reaction, such as throat swelling or widespread blistering
Severe weakness with inability to stay awake or keep fluids down
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
If you have already been diagnosed, contact your treatment team promptly about new or rapidly enlarging lymph nodes, worsening rash, unusual bruising, jaundice, dark urine, increasing weakness, or symptoms that return after treatment.
Seek same-day medical advice for a fever during chemotherapy or another treatment that weakens the immune system.
Infection can worsen quickly when white blood cell levels are low, even if other symptoms seem mild.
3
Does any of this apply?
Book an appointment
Arrange a routine medical appointment if you have lymph nodes that remain enlarged, unexplained fever or night sweats, ongoing itching or rash, or weight loss without a clear cause.
These symptoms are much more often caused by other conditions, but persistent symptoms should be assessed.
Every sign above is quoted from the sofidex article on Immunoblastic lymphadenopathy. If you are not sure, err upward — it is always reasonable to be checked.