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 have signs of severe infection or sepsis, such as new confusion, severe difficulty breathing, fainting, blue or mottled skin, or being very difficult to wake.
These symptoms do not confirm sepsis, but they need emergency assessment.
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 possible UTI symptoms and you are pregnant, have a urinary catheter, have a weakened immune system, or have a known kidney or urinary tract problem.
Men and children with possible UTI symptoms should also be assessed rather than relying only on self-care.
Arrange urgent same-day assessment if you have:
Fever or shaking chills with urinary symptoms
Pain in your back or side below the ribs
Vomiting or difficulty keeping fluids or medicine down
Rapidly worsening symptoms
Visible blood in your urine
Symptoms that do not begin improving after treatment starts
A return of symptoms soon after finishing antibiotics
For milder bladder symptoms without these risk factors, a pharmacist, primary care service, or urgent care service can advise on testing and treatment.
Do not delay assessment if you are becoming more unwell.
And for anyone, someone who:
has a fever with a stiff neck, a rash that does not fade under pressure, or severe headache
has a wound that is hot, spreading red, or leaking pus
Every sign above is quoted from the sofidex article on Urinary tract infections. If you are not sure, err upward — it is always reasonable to be checked.