Waking up with ringing in your ears — or noticing it appear out of nowhere during the day — is understandably alarming. Most sudden tinnitus has an identifiable cause, and many cases resolve on their own. But some require prompt medical attention. Here's how to tell the difference.
The Most Common Causes of Sudden Tinnitus
Noise Exposure
The most frequent trigger. A single loud event — a concert, a gunshot, an explosion, industrial machinery — can damage the auditory hair cells and produce immediate tinnitus. Post-noise tinnitus often settles within hours or days, but not always.
Ear Infection or Congestion
Middle ear infections, outer ear infections, and congestion from a cold or sinusitis can all cause or worsen tinnitus by affecting pressure in the ear. This typically resolves when the infection clears.
Ear Wax Blockage
A build-up of ear wax that presses against the eardrum can cause sudden tinnitus, often alongside a sensation of fullness or muffled hearing. Removal by a GP or audiologist usually resolves it quickly.
Medication Side Effects
A number of medications are ototoxic — capable of damaging hearing or causing tinnitus. These include high-dose aspirin, some antibiotics (particularly aminoglycosides), quinine, and certain cancer treatments. If tinnitus appeared after starting a new medication, mention this to your prescribing doctor.
Stress and Anxiety
Acute stress can trigger or dramatically worsen tinnitus. The mechanism isn't fully understood, but stress affects blood flow, muscle tension, and the nervous system's sensitivity — all of which can influence tinnitus perception. Tinnitus that appeared during an intensely stressful period may ease as stress reduces.
Sudden Sensorineural Hearing Loss
This is the one that requires urgent attention. Sudden sensorineural hearing loss (SSNHL) — typically appearing on waking as muffled hearing in one ear, often with tinnitus — is a medical emergency. Treatment with corticosteroids within the first 24–72 hours significantly improves outcomes. Don't wait to see if it improves on its own.
Other Possible Causes
- High blood pressure — vascular tinnitus can appear as a pulsing or whooshing in one ear
- Jaw problems (TMJ) — temporomandibular joint issues can cause or worsen tinnitus
- Head or neck injury — trauma affecting the auditory pathways
- Ménière's disease — sudden episodes of tinnitus, hearing loss, and vertigo
- Acoustic neuroma — a benign tumour on the auditory nerve; rare, but causes tinnitus in one ear
When to See a Doctor Urgently
Go to your GP or A&E today if:
- Tinnitus appeared suddenly in one ear, especially with hearing loss
- You have tinnitus that pulses in time with your heartbeat
- Tinnitus is accompanied by dizziness or vertigo
- You had a head injury before it appeared
When It's Safe to Monitor for a Few Days
If tinnitus appeared after a clearly identifiable cause (a loud event, a cold, new medication, a stressful week) and there's no accompanying hearing loss, dizziness, or other symptoms, it's reasonable to monitor for a few days before seeking help. If it hasn't improved in a week, see your GP.
The Bottom Line
Most sudden tinnitus has a cause — and many causes are reversible. The key questions are: is it in one ear, is there hearing loss, and did it come with other symptoms? If yes to any of these, act quickly. If it seems linked to a specific trigger and you're otherwise well, monitor it and use background sound in the meantime.