My Vagina Smells Sour

My Vagina Smells Sour
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Is Your 'Yeast Infection' Something Else?
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Tracy Middleton
Tracy Middleton, the Health Director of Women's Health, has more than 20 years' experience covering health and wellness.

Sarah Bradley
Sarah Bradley is a freelancer writer from Connecticut, where she lives with her husband and three sons.

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Anyone with a vagina has probably wondered at least once if their life, Why does my vagina smell? But let’s get one thing out of the way right now: Despite what your awful ex or the latest douching ads say, your vagina is supposed to have a bit of an odor.
"Just like with the gut, the vagina has its own microbiome filled with different bacteria and yeast, many of which are incredibly helpful," says Mary Jane Minkin, MD, a clinical professor of obstetrics and gynecology at the Yale University School of Medicine in New Haven, Connecticut. And, yep, those bacteria give your vag its signature scent.
But what does that typically smell like? "The acidic pH naturally found in the vagina might make it a little sour smelling, sometimes a little musty," says Christine Masterson, MD, ob-gyn and chief of the women and children’s service line at Summit Medical Group. "But it shouldn't be an overwhelming odor."
Still, there are times when you catch a waft that smells a bit off from your normal. The cause can be as innocuous as sweat or more serious, like an infection, says Dr. Minkin, so it’s worth taking a deeper whiff (yes, really), especially if the unusual aroma is accompanied by symptoms like itching or discharge.
Curious about an abnormal scent down there? Scan through to see if your detected smell is on our list and the possible cause(s), and don’t hesitate to get yourself checked out by a professional either way.
The most likely culprit behind this scent is bacterial vaginosis (BV), the most common vaginal infection in women ages 15 to 44, according to the Centers for Disease Control and Prevention (CDC). The infection can creep in when the vagina’s pH gets thrown out of whack by an overgrowth of "bad" bacteria, says Dr. Minkin.
Docs aren’t sure why this happens, but BV isn’t an STI, stresses Dr. Minkin, so BV on its own is pretty harmless. Still, you may be able to re-balance your vaginal acidity with some over-the-counter "pH warfare," says Dr. Minkin. Check your local drugstore for a pH gel, which is designed to balance out your vagina’s pH and nix odors.
If this doesn’t take away the smell within a week or so, see your ob-gyn. You might need an antibiotic to clear up the infection, or you might actually have trichomoniasis, a common and easily treatable (via antibiotics) STI.
Most yeast infections aren’t terribly smelly, but occasionally the thick, cottage cheese-like discharge that’s a hallmark of the itchy nuisance has a faint scent of beer or yeast. If you notice redness or burning around your vagina, or have pain after you pee, this is the likely cause, says Dr. Minkin.
Diabetic women may especially notice this since yeast feed on sugar, and diabetic women tend to have more glucose (a.k.a. sugar) in their vaginal secretions, says Dr. Minkin. See your doc about what's going on down there, and she might prescribe something or recommend something you can buy OTC.
Two questions: Did you just pound out a major sweat session at the gym and are you wearing synthetic underwear (think: nylon or polyester)?
Exercise and non-breathable knickers can cause a musky smell from trapped sweat, says Dr. Minkin. It should go away as soon as you shower (use just water or a mild soap). To minimize the scent in the future, switch to cotton undies (or at least ones that have a cotton lining) and don’t sit around with sweaty clothes.
"Sometimes citrus fruit can cause a sweet odor."
Of all the scents your vagina can have, this is definitely the most concerning one. A tampon that’s been left in your vagina for days or longer can smell rancid or foul. "The scent is brought on by an overgrowth of bacteria in a confined space," she says.
To dislodge it yourself, lie on your back or squat with one foot propped on the toilet, then reach into your vagina with clean fingers to search for the string. No luck? See your ob-gyn who can use a speculum to get the job done.
One thing to note, though: If left behind too long the bacteria can sometimes lead to a more serious infection that may require medical treatment. If you know your tampon's been in for more than eight hours and you've got flu-like symptoms (fever, nausea, achiness), see a doc, ASAP.
Blood (you know, from your period) can change the pH of your vagina, making it smell coppery or tinny, says Dr. Minkin. You can wash your vulva with non-irritating, unscented soap —just avoid going crazy with strong scented soaps because they can throw the pH even further out of whack, says Dr. Minkin. But other than that, you've just gotta ride this one out.
There’s a couple different reasons why your vagina might take on a chemical smell of bleach or ammonia: Dr. Masterson says that BV—which, again, usually smells fishy—can sometimes smell like ammonia instead.
There’s also a chance that the smell is actually coming from your urine, especially if you’re dehydrated. Lastly, Dr. Masterson says that intercourse (specifically the low-acid pH level of sperm) can trigger an ammonia smell, and so can any lubricants and spermicides you might have used. Basically, you can wait this smell out a little bit to see if it fades on its own. If it doesn't in a few days, check in with your ob-gyn.
If you notice a sweet smell down there, you might not be super inclined to think anything is wrong (it’s better than a rotten smell, right?!). And you’re pretty much right: Dr. Masterson says this is usually diet-related. "Sometimes citrus fruit can cause a sweet odor," she says. "Asparagus and garlic are known to change the way urine and discharge smell, too."
That said, she adds that yeast can sometimes cause a sweet odor, so if you’re also having symptoms of a yeast infection , grab an OTC treatment or check in with your doc.
If you’re concerned about your vaginal odor, you shouldn’t hesitate to see your doctor, says women’s health expert Jennifer Wider, MD. But, if you want to ride it out a little, Dr. Wider says it’s okay to wait a few days to see if the scent you're concerned about goes away. If the odor sticks around past then, you’ll definitely want to call your health care provider—especially if it comes with other symptoms like discharge , burning , and itching .
Why is it so important to get checked out? “Certain untreated infections can spread into the uterus and fallopian tubes which can cause long term issues, including fertility problems,” Dr. Wider says.
Finally, keep this in mind: “You should never be embarrassed to speak to your health care provider,” Dr. Wider says. “Vaginal issues are one of the more common reasons that women visit their doctor, so you are certainly not alone.” And, if you feel like you can’t talk to your doctor about this stuff, Dr. Wider says it may be time to find a new one. “An open and honest relationship with your doctor is vital for your overall health and well-being,” she says.

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Bacterial vaginosis — CDC fact sheet. Centers for Disease Control and Prevention. https://www.cdc.gov/std/bv/stdfact-bacterial-vaginosis.htm. Accessed Feb. 10, 2022.
Douching. Office on Women's Health. http://womenshealth.gov/publications/our-publications/fact-sheet/douching.html. Accessed Feb. 10, 2022.
Sobel JD, et al. Bacterial vaginosis: Clinical manifestations and diagnosis. https://www.uptodate.com/contents/search. Accessed Feb. 10, 2022.
Ferri FF. Cervical cancer. In: Ferri's Clinical Advisor 2022. Elsevier; 2022. https://www.clinicalkey.com. Accessed Feb. 10, 2022.
Ferri FF. Vaginal cancer. In: Ferri's Clinical Advisor 2022. Elsevier; 2022. https://www.clinicalkey.com. Accessed Feb. 10, 2022.
Toglia MR. Rectovaginal and anovaginal fistula. https://www.uptodate.com/contents/search. Accessed Feb. 10, 2022.
Gershenson DM, et al. Genital tract infections. In: Comprehensive Gynecology. 8th ed. Elsevier; 2022. https://www.clinicalkey.com. Accessed Feb. 14, 2022.

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Vaginal odor can change from day to day during the menstrual cycle. An odor might be especially noticeable right after having sex. Sweating also can cause a vaginal odor.
Bacterial vaginosis is an overgrowth of bacteria typically present in the vagina. It's a common vaginal condition that can cause vaginal odor. Trichomoniasis, a sexually transmitted infection, also can lead to vaginal odor. A yeast infection usually doesn't cause vaginal odor.
Possible causes of unusual vaginal odor include:
Less commonly, unusual vaginal odor may result from:
Causes shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis.
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11 Reasons Your Vagina Smells a Little…Off
Chances are your vagina smells just fine, but if you notice an unusual vaginal odor, it might be related to these causes.
1. You accidentally left a tampon in there.
4. You recently had sex without a condom.
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9. You have pelvic inflammatory disease (PID).
11. You’re wearing the wrong underwear.
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Korin is a former New Yorker who now lives at the beach. She received a double B.A. in International Relations and Marketing from The College of William & Mary (which she doesn't use at all now) and an M.A. in Interactive Journalism from American University. Korin has been published in... Read more
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Fact: Having some type of vaginal odor is normal. Despite all of the marketing that tells you otherwise, there is likely nothing wrong with the way your vagina smells. It’s completely natural and normal for you to have some kind of vaginal odor. And no, that scent probably won’t be a field of wildflowers. It’s a vagina, not a perfume counter.
Chances are, you smell just fine. But if you’ve noticed a change in your vaginal odor that doesn’t go away, it’s worth bringing up with your doctor. Here are a few things that might cause your vagina’s natural scent to go awry.
Vaginal odor is the smell that your vagina—and usually your discharge—gives off. A certain amount of vaginal odor is normal, according to the American College of Obstetricians and Gynecologists (ACOG). But if the odor is strong and noticeable, it’s possible that you have an infection or other problem, ACOG says.
There are a few things that might cause your vaginal odor to go awry:
It happens—and probably more often than you’d think, Lauren Streicher , M.D., a professor of clinical obstetrics and gynecology at Northwestern University Feinberg School of Medicine, tells SELF. Some people may put in a just-in-case tampon toward the end of their period and forget about it, don’t remember that they already have one in before putting in a new one, or forget and have sex with one in and it gets pushed sideways into the back of cervix, she says. “Every gynecologist has had the experience of a woman coming in with an odor, discovering it was a forgotten tampon, and feeling mortified,” she says.
Bacterial vaginosis (usually just known as B.V.) is the most common vaginal infection in people ages 15 to 44, per the Centers for Disease Control and Prevention (CDC), and it happens when there is too much of certain bacteria in your vagina. This throws off the pH of your vagina.
Experts aren’t sure what causes B.V. or how some people get it, but they do know that it usually occurs in people with vaginas who are sexually active. People who douche are also at an increased risk of developing B.V. The odor actually happens due to the change in your vaginal pH when the balance of good and bad bacteria down there is thrown out of whack, Jessica Shepherd , M.D., an assistant professor of clinical obstetrics and gynecology and director of Minimally Invasive Gynecology at the University of Illinois College of Medicine at Chicago, tells SELF. Luckily, it’ll go away once B.V. is treated with antibiotics, Dr. Streicher says.
You’ve probably heard that eating pineapple or citrus fruits can make you smell sweeter down there, and that fried foods can make your vagina smell more strongly. “I hear this all the time, but it’s all anecdotal,” Dr. Streicher says. So there’s no scientific evidence behind this, but experts have certainly heard of it happening before.
If you find that your usual scent is off and you know you recently ate a bunch of very fragrant foods (like garlic) or anything that’s not normally in your diet—and the change bothers you—you can consider whether what you eat may be contributing. If you’re not sure whether the change in smell is due to food or something else, call your doctor to get checked out.
You might notice things smell a little different down there after sex, which makes sense. You’ve got your fluids mixing with another person’s fluids, and maybe some sweat too. Plus, semen has an elevated pH, Dr. Streicher says, and that can cause an odor to form. Typically, the smell will clear up on its own within a day or so—or after you shower—but if it persists, call your doctor.
You’ve probably found that your vaginal odor smells a little more intense when you’re bleeding , and that’s normal, Dr. Shepherd says. Blood has an elevated pH, and that can throw your vaginal flora off a little during your period . Usually it’s not a huge change in scent, and it goes away once your period wraps up, she says.
You probably associate yeast infections with a certain discharge, but they can also cause a particular odor to develop. OTC yeast infection medications should help clear up the infection—and smell, Dr. Streicher says—but if you’ve tried that once and it didn’t work, check in with your doctor.
A stinky smell down there could signal an STI called trichomoniasis, Alyssa Dweck , M.D., a gynecologist in Westchester, New York, and assistant clinical professor of obstetrics and gynecology at Mount Sinai School of Medicine, tells SELF.
Trichomoniasis is caused by a tiny parasite that moves between people during sex, and it’s actually pretty common, according to the Mayo Clinic . In addition to a foul-smelling vaginal discharge, it can make your genitals itch and cause painful peeing, though many people experience no symptoms.
Gonorrhea and chlamydia can also cause foul-smelling discharge, says Dr. Dweck. And just like with trichomoniasis, you may not experience symptoms. If you notice any unusual discharge or have pain during sex or urination
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