Why hearing often changes before you notice it
Hearing loss is usually gradual. Conversation in a restaurant starts to feel like work, the television creeps louder, and you begin watching faces to fill in the words you missed. Most people adapt long before they book an appointment.
The change can come from anywhere along the path the sound takes. Wax or a narrowed ear canal, fluid or pressure in the middle ear, a problem with the eardrum, the inner ear itself, or the nerve that carries the signal onward. Each of those is a different diagnosis with a different treatment, and they cannot be told apart by how loud the world sounds.
One situation is handled differently. Hearing that drops suddenly in one ear, over hours or a day, is looked at promptly rather than watched, because the assessment and the decisions that follow are time-sensitive.