Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency care when hearing loss occurs with stroke-like symptoms, severe neurologic symptoms, or significant head trauma.
Contact a clinician promptly for new one-sided hearing loss, increasing asymmetry between the ears, persistent ear pain or drainage, significant dizziness, or tinnitus that pulses with the heartbeat.
Seek urgent same-day assessment for hearing that suddenly decreases over hours or within a few days.
Arrange a routine appointment if hearing difficulty is affecting conversations, television listening, work, safety, or social activities.
A primary care clinician, audiologist, or ear, nose, and throat specialist can help determine the appropriate evaluation.
People who use hearing aids usually need follow-up for fitting, comfort, sound quality, and maintenance.
Hearing can change over time, so repeat testing may be useful when symptoms worsen or devices no longer provide enough benefit.
Earwax and device problems should also be checked because either can reduce hearing-aid performance.
Every sign above is quoted from the sofidex article on Age-related hearing loss. If you are not sure, err upward — it is always reasonable to be checked.