What Causes Heightened Sense Of Smell During Pregnancy?

Reviewed by Dr. Irena Ilic, MD
Updated

Is every little smell making you queasy while you’re pregnant? Do you suddenly seem to have the nose of a bloodhound and can detect odors that are elusive to others?

The body goes through some wacky changes during pregnancy, and the nose is no exception. Your olfactory senses are suddenly amplified once you’re expecting.

I remember during my first pregnancy, I couldn’t stand the smell of bananas. And, I had been eating one a day before I got pregnant. During my second pregnancy, I couldn’t change my toddler’s diaper without retching — one of the reasons we quickly started potty training.

But, why did these smells that normally didn’t bother me suddenly become nauseating?

In this post, we’ll talk about what causes your sense of smell to heighten during pregnancy, when this crazy phenomenon begins and ends, and how to cope with those unbearable smells.


When Does Your Sense of Smell Start to Heighten?

Most women notice an amplified sense of smell during their first trimester (1). It can often be one of the very first signs that you’re expecting.

Even the slightest odor can suddenly become overpowering. Certain smells you once despised may now seem quite delightful, while others you had loved, may now make your stomach turn. You might even find your partner’s scent repulsive, or possibly even more attractive.

It’s important to remember that not all pregnancies are the same and your sense of smell can be different in your first and every other pregnancy. Meaning, if you are pregnant and reading this and you’re not experiencing the heightened sense of smell, it doesn’t mean that you won’t become a ‘’superhero sniffer’’ in your subsequent pregnancies.
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Dr. Irena Ilic, MD

Smells That Trigger This Sensitivity

The sensitivity level varies among each pregnant woman. Some women may only notice a slight to moderate increase in sensitivity, while for other women, it can be quite intense.

The odors that you’re sensitive to also vary from woman to woman. Some women might find the smell of cottage cheese and soap repulsive, while you might not be able to be near broccoli, milk, or even your perfume.

There are a few common smells that seem to have many pregnant women running to the toilet though, which include these (2):

  • Meat and fish.
  • Garlic and onions.
  • Fried foods.
  • Eggs.
  • Coffee.
  • Alcohol.
  • Cigarettes.
  • Gasoline
  • Musty, damp, and moldy smells.
  • Animals.
  • Hand sanitizer.

You’ll quickly find your super-sensitive pregnancy nose taking charge of your diet and your surroundings.

Related Reading
Pregnant woman pinching her noseWhat Causes Body Odor During Pregnancy?

Causes Of Heightened Sense of Smell During Pregnancy

When I first noticed my heightened sense of smell, I felt like a superhero. Could something have happened to me that finally triggered some of the superhuman powers I had always wanted? Unfortunately, that wasn’t the answer.

So what is it about pregnancy that gives you this super sense of smell?

Scientific research is unclear, but there are a few different theories out there:

1. Hormonal changes associated with morning sickness

You can blame those crazy pregnancy hormones once again! The rising levels of estrogen and hCG (human chorionic gonadotropin) hormones during the first trimester can cause nausea and vomiting. If you’re already nauseous, a strong odor is likely to exacerbate it (3).

Hyperosmia is also associated with hyperemesis gravidarum (4).

Fluctuations in your hCG levels correlate very closely with the changes in your sense of smell, and the intensity of nausea and vomiting. This hormone is probably the one responsible for the changes in your odor likes and dislikes. For example – if morning coffee was your pick-me-up ritual and now that you are pregnant you can’t stand the smell of your favorite beverage – you can blame the hCG.

A heightened sense of smell is so closely associated with morning sickness; researchers have even found that women born without a sense of smell don’t suffer from morning sickness at all (5). Crazy, huh?

2. Protective mechanism

Your bionic sense of smell may even be a protective mechanism to keep you away from toxins and potentially dangerous substances which could possibly harm your growing baby (6). The heightened sense of smell occurs about the time when your baby is most sensitive to these harmful substances, which is early in the pregnancy.

Some researchers suggest that your hyper-awareness of odors may arise from the fact that now that you are pregnant you are more aware of possible health risks associated with odors and your brain is hyperreactive when it comes to smell. That’s why the smell of cigarettes and alcohol might especially bother you, even if it didn’t before your pregnancy.

What can happen late in the pregnancy is opposite to this ‘’bionic sense’’ – a woman’s sense of smell may decrease. The reason behind this is straightforward – tissue in your nose becomes more swollen, leaving less space for airflow and that in turn reduces your ability to register different smells. This is the time when many pregnant women complain of a ‘’stuffy’’ nose.
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Editor's Note:

Dr. Irena Ilic, MD

Tips for Coping With This Bionic Sense

Unfortunately, there’s nothing you can do to prevent a heightened sense of smell, but there are some things you can do to help cope with those overpowering odors:

  • Use unscented toiletries and cleaning products: Switch out your strong smelling deodorant soap, and shampoo with unscented versions. Avoid harsh chemical smells and stick to natural and fragrance-free cleaning products. If you are feeling overheated and you are careful about choosing personal care products during pregnancy, there are fragrance-free deodorants you can use if you are sensitive to smells.
  • Neutralize your fridge: Rid your fridge of obnoxious smells by cleaning it out often. Store an open box of baking soda on the shelf to help neutralize odors.
  • Eat smart: Avoid cooking and eating foods you can’t stand to smell and that trigger nausea. You might have to switch out those scrambled eggs you were eating for breakfast with a yogurt parfait. You also might even need to ask your partner to do the cooking for a while.
  • Wash clothes often: Odors like to cling to fibers on your clothes and bedding and linger around, so be sure to wash them often with gentle, unscented detergent.
  • Let in some fresh air: Open up your windows to air out musty and unwanted smells. Also, go outside to get some fresh air as much as you can.
  • Avoid smoke and chemicals: You should always try to avoid smoke and chemicals while expecting. This is an excellent opportunity to ask your family members that you love so much to quit smoking or at least avoid smoking in your presence and in your family home. If the smell of smoke is lingering on a person close to you, don’t be afraid to walk away or kindly ask them to wash their hands.If your work involves having to use chemicals, be sure to ask your boss for other assignments you could do instead.
  • Minimize morning sickness: Try to keep your morning sickness under control by eating small frequent meals, taking B vitamins, drinking peppermint tea, sucking on ginger candies, and eating potatoes.
  • Have a safety net: Take along a “safety” smell for those times you need to deter your nose from an unpleasant odor. For example, you could carry some lip balm or lotion you know you’re still fond of.
  • Surround yourself with pleasant smells: Experiment to find out which smells you now find appealing. Even though many moms say that mint, lavender, and ginger were soothing during their pregnancies, be sure to explore herbs, flowers, citrus, baked goods, and surround yourself with those you love.
  • Ask for consideration: Don’t be afraid to ask your partner and coworkers to lighten up on the perfume and tuna fish. Also, you might feel uncomfortable about suddenly not appreciating the body odor of your partner so much, but make sure you discuss it openly with them and remember that this is just a phase. I’m sure they’ll be understanding of your new bionic sense.

When Do The Smell Aversions Go Away?

Don’t worry; your super sense of smell won’t stick around forever. Sometimes it sticks around until after you deliver, but most of the time it recedes early in the second trimester once your pregnancy hormones start to settle down. Some women are even lucky enough for it to last just a few short weeks in the first trimester.

Until then, hold your nose! Steer clear of offensive odors and embrace the pleasant ones.


The Nose Knows

If you’re suddenly gagging over the scent of your favorite food, it might be a sign that you are expecting.

It’s not completely elucidated why pregnancy gives us this superhuman sense of smell, but experts think it might be because of the rise in hormones associated with morning sickness, or possibly even due to a protective mechanism to avoid pathogens that could harm your baby.

This pregnancy superpower typically dies down in the second trimester, but until then do your best to cope with the smells.

Avoid using scented toiletries, detergents, and cleaning products, wash your clothes often, open up some windows, neutralize your fridge, and surround yourself with pleasant smells. Take a day to make the most out of this phenomenon and visit a garden or a bakery!

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Headshot of Dr. Irena Ilic, MD

Reviewed by

Dr. Irena Ilic, MD

Dr. Irena Ilic received her medical degree from the University of Kragujevac, Serbia. Working as a University affiliated researcher, she published over 20 papers in renowned international journals. Irena has a special interest in female health issues and is passionate about evidence-based medicine.
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18 Reader Comments

  1. My house has a weird musty smell. Except no one else can smell it, and I can’t even describe it.

    • Nickki

      I’m really struggling at work because I deal with food. I was using sea bands and they worked for a while but not anymore. Does anyone have any suggestions on what I can do? This is pregnancy #4 and I experienced intense nausea each time.

      • Team Mom Loves Best

        Hey Nickki, working with food while being sensitive to smells in pregnancy must be so difficult. Our top tips in your situation — where there’s little control over the surrounding scents — is to bring a scent you like with you. That seems to be your best option now. But hopefully, our other mamas will have some other helpful solutions.

  2. Temi

    I have the same problem. My house has a weird musty smell. I try to keep the windows open, and sometimes the door as well, in order to keep the smell away. I really can’t wait for the bionic nose thing to stop.

    • Jenny Silverstone

      Hello,

      I hope your sense of smell calms down soon! I made my husband take out the trash every day when I was pregnant because I could not handle the smell. Are you having any luck with keeping the windows open?

      Best,
      Jenny

  3. Erin

    My living room smells like wet carpet, I swear. Nobody else seems to smell it though. I vacuum every day, three times a day but the smell will not go away. My family thinks I’m losing it.

    • Jenny Silverstone

      Hi Erin,

      I’m sorry you are going through this, but this is so relatable. When I was pregnant with my oldest, I could not stand the smell of trash being in the house. It didn’t matter if it had been taken out the day before or not, I could smell it. Hopefully, your nose eases up on you soon!

  4. Joy

    My heightened sense of smell is really getting to me. I can’t stand the smell of my bathroom or even my son’s bath soap. I really hope this goes away soon.

    • Jenny Silverstone

      I’m sorry you are dealing with this, I had an issue with it as well during my pregnancy. Have you found anything that helps with the problem?

  5. Ash

    I can’t stand the smell of meat. Even cooked meat smells raw to me, and the smell makes me gag.

    • Jenny Silverstone

      I’m sorry you’re dealing with that. Have you found anything to help you deal with the aversion? I hope you find something soon!

  6. Sunny

    My husband is now very smelly to me, and my oldest dog in particular also but not the other two… so weird what hormones do to us!!!

    • Team Mom Loves Best

      Hey, Sunny! Ha, yes! Hormones sure do get women in pregnancy. How far along are you? 🙂

    • I thought it was just me! So glad to know I’m not alone lol. My husband will get out of the shower and he still stinks to me lol. My little chihuahuas feet kill me they stink so bad hahah. Also the smell of our new apartment kills me. No one else smells it but me.

  7. OMG,

    My home smells so disgusting. It smells like something died. I keep cleaning and it won’t go away. Only opening the windows helps. Thank God it’s summer. My husband thinks I’m weird. I hate it so much. I have every stupid and weird pregnancy symptom in the book. I can’t wait for this BS to end. Ughhh

    • Team Mom Loves Best

      Hey Natalie, we completely understand. Not many people talk about the difficult parts of pregnancy, but we’re rooting for you. How far along are you?

  8. Gary Chalmers

    My wife acts like she’s completely lost her senses … well … that is, except her sense of smell, of course. She feels dizzy near steamed meat. It kept going for a week now. Everytime she comes back home from work, she vacuums every room at least three times. She particularly avoids the scent of meat and water vapor. She developed a habit of cleaning literally everything.I’ve never seen her do that before. Really interesting article. It helped my wife’s sense of smell to calm down a bit on her :).

    • Team Mom Loves Best

      Hi Gary, haha! We’re so happy you and your wife felt seen by our article. Hopefully, this will all be worth it when the little one comes 🙂 In the meantime, enjoy the clean house 😉

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