Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services for sudden difficulty breathing, swelling of the tongue or throat, fainting, or widespread hives.
These may indicate a serious allergic reaction or another emergency rather than nonallergic rhinopathy.
Heavy bleeding that does not stop with firm pressure also requires emergency help.
And for anyone, someone who:
Seek prompt medical care for severe facial pain, swelling around an eye, a high fever with worsening nasal symptoms, vision changes, or a severe headache.
Clear fluid draining continuously from one nostril after a head injury or nasal surgery also needs urgent assessment.
Make a routine medical appointment if nasal blockage or drainage lasts for several weeks, repeatedly affects sleep or daily life, or does not improve with reasonable self-care.
You should also arrange an assessment for frequent nosebleeds, reduced smell, ongoing cough, or symptoms that are mainly on one side.
Every sign above is quoted from the sofidex article on Nonallergic rhinopathy. If you are not sure, err upward — it is always reasonable to be checked.