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 hearing loss accompanied by signs such as facial drooping, weakness on one side, difficulty speaking, confusion, inability to walk, or a severe sudden headache.
These symptoms may indicate a neurological emergency rather than otosclerosis.
Seek same-day urgent medical assessment if hearing drops suddenly over hours or a few days, even if the ear does not hurt.
Sudden hearing loss is not typical of otosclerosis and may need time-sensitive treatment.
Contact the surgical team promptly after ear surgery if you develop worsening pain, fever, discharge, facial weakness, severe or persistent vertigo, or a sudden reduction in hearing.
Arrange a routine hearing assessment if you have gradually worsening hearing, persistent tinnitus, or difficulty following conversations.
These symptoms have several possible causes and need proper hearing tests rather than self-diagnosis.
Every sign above is quoted from the sofidex article on Otosclerosis. If you are not sure, err upward — it is always reasonable to be checked.