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 severe difficulty breathing, blue or grey lips, fainting, confusion, chest pain with marked breathlessness, or coughing up a large amount of blood.
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
Arrange prompt medical assessment if you have a cough lasting three weeks or more, particularly with fever, night sweats, weight loss or known TB exposure.
Seek advice sooner if you have HIV, take immune-suppressing medicine or have another condition that weakens your immune system.
If you are being treated for TB, contact your treatment team promptly if symptoms worsen, doses are repeatedly missed, or side effects make it difficult to continue.
Seek urgent medical care for:
Any unexplained coughing up of blood, even a small amount
Yellow skin or eyes, dark urine or persistent vomiting during treatment
New blurred vision, altered colour vision or significant eye pain
A widespread rash, facial swelling or breathing difficulty after medicine
Severe headache, confusion, unusual drowsiness or neck stiffness
Every sign above is quoted from the sofidex article on Pulmonary tuberculosis. If you are not sure, err upward — it is always reasonable to be checked.