12 Symptoms ENT Doctors Say Never to Ignore

—Photo-Illustration by Chloe Dowling for TIME (Source Images: PM Images/Getty Images, Plume Creative/Getty Images (2)) You might see an ear, nose, and throat (ENT) doctor for recurring sinus infections.

Someone else might see one for a thyroid tumor, a voice that won’t return after a cold, or trouble breathing during sleep .

They’re all within an ENT’s purview.

These doctors, formally called otolaryngologists, treat conditions involving the ears, nose, throat, and much of the head and neck.

That includes problems affecting your hearing, swallowing, breathing, and voice—and some that require urgent care.

“A lot of people will think, ‘Oh yeah, there’s no emergencies at ENT,’ and there absolutely are,” says Dr.

Ryan Salvador, an ENT surgeon at Sinus & Snoring Specialists in Austin.

We asked three otolaryngologists what they wish patients wouldn’t ignore.

Sudden hearing loss in one ear You answer your phone and realize you can barely hear your friend’s voice out of your left ear.

Switch to your right side, and everything sounds normal.

It’s tempting to assume the muffled ear needs to pop, Salvador says.

But an abrupt change in hearing can be a medical emergency.

One possibility is sudden sensorineural hearing loss, which affects the inner ear.

Salvador knows how easily it can be mistaken for something else: His father went to urgent care and was told he had fluid behind his eardrum.