If you cannot determine the cause of your hearing loss, see a doctor.

Other symptoms that require a trip to the doctor include the following:
    • You have associated symptoms such as ringing in the ears or vertigo.
    • You have a fever or pain.
    • You are taking any medications that affect hearing.
    • Your hearing loss is sudden and prolonged.
Do not delay getting medical attention if your hearing loss is associated with any of the following:
    • Recent or present foreign body in the ear
    • Fluid or blood coming from the ear
    • Recent pressure changes (diving)
    • Fever not controlled with acetaminophen (Tylenol)
    • Severe trauma to the head

Excerpt from Hearing Loss, emedicinehealth.com