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 urgent or emergency care for severe symptoms or when the action plan indicates that home treatment is not working.
And for anyone, someone who:
is struggling to breathe, gasping, choking, or cannot get words out
Other emergency signs, for anyone
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
Does any of this apply?
Book an appointment
Follow-up is also important soon after a flare-up or treatment change.
A routine review may cover:
Daytime symptoms, night waking, activity limits, and reliever use
Flare-ups, urgent visits, and oral corticosteroid treatment
Inhaler technique and whether medicines are being used as planned
Side effects, cost, or other barriers to treatment
Smoking, vaping, allergens, workplace exposures, and other triggers
Lung function when appropriate
Whether the written action plan is current and understood
Arrange a routine appointment if breathing is gradually worsening, night symptoms return, usual activities become difficult, or quick-relief treatment is needed more often.
The article also says
Asthma should be reviewed periodically, even when symptoms are mild.
Treatment may be stepped up when control is poor.
When asthma has been well controlled for a sustained period, a clinician may consider carefully stepping treatment down to the lowest level that maintains control.
Preventive medicine should not be stopped or reduced without a plan, because symptoms alone may not reflect the risk of a future attack.
Every sign above is quoted from the sofidex article on Asthma. If you are not sure, err upward — it is always reasonable to be checked.