Hearing Health During Pregnancy: What Expecting Mothers Should Know

Nobody warns you about your ears. Pregnancy books devote chapters to morning sickness, stretch marks, the strange cravings — but the ringing that showed up at fourteen weeks? The cotton-ball feeling in your left ear that won’t quit? Those get zero airtime. And honestly, that silence does more harm than the symptoms themselves. If something feels off with your hearing since you got pregnant, you’re not losing your mind. You’re in very crowded company.

Hormonal surges, a spike in blood volume, and the body’s tendency to hoard fluid during pregnancy can all rattle the inner ear — triggering tinnitus, temporary hearing dips, or, on rare occasions, sudden sensorineural hearing loss. The vast majority of these symptoms fade after delivery. But any new hearing complaint while you’re expecting deserves a fast look by an audiologist or ENT, partly because tinnitus can sometimes flag preeclampsia [1].

Why Pregnancy Affects Your Hearing

The Hormonal and Vascular Connection

Think of the cochlea — that tiny, snail-curled organ deep in your ear — as a finely tuned hydraulic instrument. It runs on precise fluid pressures and steady blood flow. Now flood the system with estrogen and progesterone, crank up the plasma volume by nearly half, and see what happens.

That’s basically pregnancy. By week 32, circulating plasma sits roughly 45–50 percent above where it was before conception [2]. Not a subtle bump. The body also stockpiles around 6.5 liters of extra extracellular fluid, plus another 1.2 liters inside cells [2]. All that liquid has to go somewhere, and the cochlea — nestled right next to major blood vessels — catches the overflow. The result can mimic Ménière’s disease: low-frequency hearing wobble, a stuffed-up sensation in the ear, bouts of tinnitus. No infection, no wax buildup, just the inner ear getting waterlogged by the same physiology that’s growing a human.

Tinnitus: The Ear Complaint Nobody Mentions at Prenatal Visits

Here’s a number that surprises almost every patient I share it with: about one in three pregnant women develops tinnitus. Among non-pregnant women the same age, the rate hovers closer to one in ten [3]. A Brazilian research group found an even steeper figure — 52 percent of pregnant participants reported it, dwarfing the global background prevalence of roughly 15 percent [4].

Timing matters, too. Two-thirds of women who already lived with tinnitus before getting pregnant say it cranks up during the middle trimester [3]. New-onset cases tend to tag along for the whole pregnancy, then quiet down — sometimes vanishing entirely — once the baby arrives. Reassuring? Mostly. But I always tell patients at Audiology Island: don’t just shrug it off. Fresh tinnitus in an expectant mother can be a red flag for gestational hypertension or preeclampsia, which hits about 5 percent of pregnancies and drives a third of very premature deliveries [5]. If you’re unsure whether what you’re experiencing qualifies, our guide to tinnitus evaluations and treatment walks through exactly what to expect during an assessment.

Subclinical Cochlear Changes

Some shifts stay invisible on a standard hearing test. One study screened 50 healthy, third-trimester women whose audiograms looked perfectly normal — yet 26 percent of them had absent DPOAEs, a sign that outer hair cells in the cochlea were already struggling. Only 4 percent of non-pregnant controls showed the same deficit [6]. Translation: the ears can be under real physiological stress even when a beep test says “all clear.” Women carrying pre-existing vulnerabilities — poor nutrition, a history of noise exposure, prior contact with ototoxic medications — seem to tip over that edge more easily.

“Patients are genuinely surprised when I bring up hearing changes in pregnancy. But the women who mention ear fullness or ringing early on tend to worry far less once we walk them through why it’s happening and confirm nothing sinister is lurking underneath. Sometimes the best treatment is a thorough explanation and a monitoring plan.” — Dr. Stella Fulman, Au.D., Audiology Island

Sudden Hearing Loss in Pregnancy: Rare, but You Can’t Ignore It

Sudden sensorineural hearing loss — a nosedive of more than 30 dB across three adjacent frequencies inside 72 hours — already qualifies as uncommon. In pregnant women, it’s rarer still. Taiwan’s population data peg the incidence at a mere 2.71 per 100,000 pregnancies [7]. Over seven years at one large Chinese university hospital, pregnant patients made up just 0.7 percent of every SSNHL case that walked through the door [8].

Rare, though, doesn’t mean trivial. When it strikes during pregnancy, the pattern is consistent: over 80 percent of cases land in the second or third trimester, and the average patient is only 29.6 years old — decades younger than the usual SSNHL demographic of 50- to 60-year-olds [7][8]. Treatment gets tricky, because systemic steroids pose fetal risks. Intratympanic steroid injections sidestep that problem by delivering medication locally, and 53.3 percent of pregnant women who received them saw measurable hearing gains. Women given no treatment? Zero improvement [8]. Elevated fibrinogen in the pregnant SSNHL group — 3.77 g/L versus 2.54 in controls — points toward a hypercoagulable mechanism that researchers are still unraveling. We’ve covered the urgency of this condition in greater detail in our post on understanding sudden hearing loss — the takeaway is always the same: don’t wait.

Your Baby’s Hearing Is Taking Shape Right Now

Fetal Auditory Milestones

While the mother’s ears may be acting up, the baby is quietly building an auditory system from nothing — and the construction timeline is faster than you’d guess. Structures of the inner ear start assembling by week 5. Around week 18, the fetus picks up its first sounds: the mother’s heartbeat, her stomach growling, blood whooshing through the cord [9]. External voices and music begin filtering in by weeks 23 to 25, though amniotic fluid and tissue muffle outside noise by about 30 decibels [10].

Here’s the counterintuitive part. That muffled, bass-heavy soundscape? It may actually be doing the baby a favor. MIT researchers showed that computational models trained first on low-frequency-only input — mimicking what a fetus hears — outperformed models given full-spectrum sound from the start when later tested on complex auditory recognition tasks [11]. The womb’s acoustic filter isn’t a limitation. It looks more like a feature. The American Speech-Language-Hearing Association (ASHA) offers a useful overview of how these prenatal milestones connect to the listening and language skills a child develops after birth.

Noise Exposure and Fetal Risk

Flip that coin, and the picture gets sobering. Researchers at Stockholm’s Institute of Environmental Medicine linked occupational noise exposure during pregnancy to an up to 80 percent jump in the child’s risk of hearing problems [12]. The danger threshold: sustained levels above 80 decibels. And here’s the catch that trips people up — wearing earplugs or muffs protects the mother’s ears, but sound still reaches the fetus through bone and tissue conduction. The baby has no earplugs.

Chronic loud-noise exposure during pregnancy has also been tied to premature birth and low birth weight [12]. If your workplace regularly exceeds 80 dB — a factory floor, a tarmac, a music venue — having a frank conversation with both your OB and an audiologist about accommodations isn’t overcautious. It’s clinically sound advice. Our article on temporary hearing loss discusses how noise-induced damage works and why early action matters.

Congenital Hearing Loss: What the Numbers Actually Mean

Somewhere between 1 and 3 out of every 1,000 newborns arrive with detectable hearing loss. Genes drive 50–60 percent of those cases in developed countries [13][14]. The 2022 EHDI data out of the CDC identified more than 6,000 U.S. infants with permanent hearing loss that year alone, with screening coverage topping 98 percent [14]. Congenital cytomegalovirus infection accounts for about 10 percent of cases at birth — a share that creeps up to 15–20 percent during childhood as delayed-onset losses surface [15].

One statistic every new parent should sit with: the prevalence of hearing loss doesn’t stay flat after birth. It climbs from 1.33 per 1,000 in newborns to approximately 3.5 per 1,000 by adolescence [15]. A clean newborn screening is a wonderful start. It’s not a lifetime guarantee. That’s one reason we take pediatric hearing evaluations so seriously — catching what screening misses can change a child’s developmental trajectory entirely. The CDC’s Early Hearing Detection and Intervention program publishes updated data annually for families and clinicians who want to track how these numbers are evolving.

Conclusion

Pregnancy reshapes the body in ways that prenatal pamphlets routinely skip — and the auditory system, both the mother’s and the growing baby’s, belongs much higher on the clinical checklist than it currently sits. Most ear symptoms during pregnancy are temporary, reversible, and manageable with straightforward monitoring. The real risk isn’t the symptoms — it’s the silence around them: not knowing that tinnitus might signal preeclampsia, or that a loud workplace can reach the fetus in ways no earplug can block. As audiology weaves itself more tightly into prenatal care, Dr. Zhanneta Shapiro and I at Audiology Island expect earlier referrals, sharper outcomes, and far fewer women gritting their teeth through symptoms they never realized had anything to do with pregnancy.

FAQ

Can pregnancy cause permanent hearing loss?

Almost never. The hormonal and fluid-driven changes that affect hearing during pregnancy typically reverse after delivery. Sudden sensorineural hearing loss is an exception — rare, but it demands immediate treatment [8].

Is tinnitus during pregnancy dangerous?

In most cases, no — it’s the single most common ear complaint in pregnancy and usually fades postpartum. That said, new-onset ringing should always be flagged with your provider because it can occasionally signal high blood pressure or preeclampsia [3][5].

Can loud noise hurt my baby’s hearing before birth?

It can. Prolonged exposure above 80 decibels has been linked to a higher risk of hearing deficits in newborns, and maternal ear protection does nothing to shield the fetus [12].

When does a baby start hearing in the womb?

Internal body sounds — heartbeat, digestion — become detectable to the fetus around 18 weeks. External voices and music register by roughly 23 to 25 weeks of gestation [9][10].

Should I get a hearing test during pregnancy?

If you notice anything new — ringing, fullness, muffled hearing, sudden loss in one ear — absolutely. Routine screening isn’t standard prenatal protocol, but symptom-driven evaluation is always warranted.

Does otosclerosis get worse during pregnancy?

Depends on which study you read. Some report subjective worsening in around 21 percent of affected women during pregnancy; others find no measurable change in hearing thresholds at all [16][17].

How common is congenital hearing loss?

Roughly 1.2 to 1.7 per 1,000 live births in the United States are identified with permanent congenital hearing loss. Genetic factors underlie about half of all cases [13][14].

Sources

[1] “Tinnitus and pregnancy.” Tinnitus UK. Accessed April 2025. Retrieved from: https://tinnitus.org.uk/understanding-tinnitus/living-with-tinnitus/tinnitus-and-pregnancy/

[2] Kwatra, D., Kumar, S., Singh, G.B., et al. “Can Pregnancy Lead to Changes in Hearing Threshold?” Indian Journal of Otolaryngology and Head & Neck Surgery, 2021. Retrieved from: https://journals.sagepub.com/doi/full/10.1177/0145561319871240

[3] “Tinnitus and pregnancy.” British Tinnitus Association / Tinnitus UK. Retrieved from: https://tinnitus.org.uk/understanding-tinnitus/living-with-tinnitus/tinnitus-and-pregnancy/

[4] Schmidt, P.M., et al. “Hearing and vestibular complaints during pregnancy.” Brazilian Journal of Otorhinolaryngology, PMC, 2022. Retrieved from: https://pmc.ncbi.nlm.nih.gov/articles/PMC9446035/

[5] “Tinnitus during pregnancy: how to explain it.” Les Centres Masliah, 2022. Retrieved from: https://www.lescentresmasliah.com/en/tinnitus-during-pregnancy-how-to-explain-it/

[6] “Hearing loss in pregnancy.” Indian Journal of Otology, PMC, 2013. Retrieved from: https://pmc.ncbi.nlm.nih.gov/articles/PMC3585551/

[7] “Clinical management and progress in sudden sensorineural hearing loss during pregnancy.” PMC, 2020. Retrieved from: https://pmc.ncbi.nlm.nih.gov/articles/PMC7593668/

[8] “Sudden sensorineural hearing loss during pregnancy: etiology, treatment, and outcome.” PMC, 2021. Retrieved from: https://pmc.ncbi.nlm.nih.gov/articles/PMC7925942/

[9] “Fetal development: The 2nd trimester.” Mayo Clinic. Accessed April 2025. Retrieved from: https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/fetal-development/art-20046151

[10] “When Can a Fetus Hear: Womb Development Timeline.” Healthline, 2018. Retrieved from: https://www.healthline.com/health/pregnancy/when-can-a-fetus-hear

[11] “Early sound exposure in the womb shapes the auditory system.” MIT News, May 2022. Retrieved from: https://news.mit.edu/2022/prenatal-sound-womb-auditory-system-0525

[12] “Hearing Loss Risks During Pregnancy.” Resonance Audiology, citing Institute of Environmental Medicine, Stockholm. Retrieved from: https://resonanceaudiology.com/need-know-hearing-loss-pregnant/

[13] Korver, A.M., et al. “Congenital hearing loss.” Nature Reviews Disease Primers, 2017. Retrieved from: https://pmc.ncbi.nlm.nih.gov/articles/PMC5675031/

[14] “Data and Statistics About Hearing Loss in Children.” CDC, updated 2025. Retrieved from: https://www.cdc.gov/hearing-loss-children/data/index.html

[15] “Analysis of congenital hearing loss after neonatal hearing screening.” Frontiers in Pediatrics, 2023. Retrieved from: https://www.frontiersin.org/journals/pediatrics/articles/10.3389/fped.2023.1153123/full

[16] “Does pregnancy have an influence on otosclerosis?” The Journal of Laryngology & Otology, Cambridge Core, 2021. Retrieved from: https://www.cambridge.org/core/services/aop-cambridge-core/content/view/7701D666E846C0772C84CE1706DBA78E

[17] Lippy, W.H., et al. “Does pregnancy affect otosclerosis?” Laryngoscope, 2005. Retrieved from: https://pubmed.ncbi.nlm.nih.gov/16222205/