Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
If same-day primary or specialist care is unavailable, an urgent care or emergency service may be appropriate.
Call emergency services if hearing loss occurs with signs of a stroke or serious neurological problem, such as:
Seek same-day urgent medical assessment if hearing suddenly decreases in one or both ears, including if you wake up with hearing loss.
Sudden sensorineural hearing loss can be mistaken for earwax or congestion, but the inner ear needs to be considered quickly.
Sudden loss with new tinnitus, ear pressure or vertigo also needs urgent assessment.
Arrange a routine hearing assessment if hearing has gradually declined, conversations are becoming difficult, tinnitus persists or one ear seems consistently worse.
Children with possible hearing or speech-development concerns should also be assessed rather than waiting for them to “grow out of it.”
Every sign above is quoted from the sofidex article on Sensorineural deafness. If you are not sure, err upward — it is always reasonable to be checked.