Fishy smell down there
You notice a strong fishy smell from your vagina. It is often worse after sex or right after your period. You may also see thin grey or white discharge.
Most of the time this is bacterial vaginosis, or BV. It means the mix of germs that normally live in the vagina has shifted. It is very common, and it does not mean you are dirty.
BV is not caused by poor washing. In fact, washing inside often makes it worse.
When to see someone
Go to an emergency room or urgent care today if you have a fever and pain in your lower belly. Go if you feel very unwell or are being sick. Go if you have chills with belly pain.
Go the same day if you cannot get a tampon out. Go if one has been in for days and you feel ill.
Call your doctor or midwife this week if you are pregnant and notice this smell. BV in pregnancy is linked to early labor. It is worth treating.
Book a sexual health clinic or your doctor soon if you have green or yellow discharge. Go if you have sores, blisters, or warts. Go if it hurts to pee or hurts during sex.
See a doctor if the smell keeps coming back after treatment. Ask for a test rather than guessing again. Also see someone if you bleed between periods.
Go to a doctor if the smell is like stool or gas. That is rare and needs a check.
Why it happens
A healthy vagina is full of good bacteria called lactobacilli. They make acid, which keeps the inside slightly sour and keeps other germs in check.
When those good bacteria drop, other germs grow instead. Some of them make chemicals called amines. Amines are what smell fishy.
Those chemicals smell stronger when things turn less acidic. Semen and period blood both do that. This is why the smell often spikes after sex or during a period.
Douching, scented washes, and soap inside the vagina can also wash out the good bacteria. A new partner, more partners, or an IUD can raise the risk too. Smoking is linked to it as well.
What else it could be
A fishy smell is the classic sign of BV, but it is not the only cause. Getting the cause right matters, because the fixes are not the same.
Trichomoniasis, or trich, is a sexually passed infection. It can also smell fishy, but the discharge is often yellow or green, frothy, and comes with itching or soreness. Trich needs prescription treatment, and your partner needs treating too, so a test is worth it.
A yeast infection is a different problem. Yeast usually means thick white discharge like cottage cheese, with strong itching and redness.
It does not usually smell fishy. Yeast creams will not help BV.
A forgotten tampon, condom, or menstrual cup causes a very foul, rotten smell, not just fishy. The smell is strong and gets worse each day. That needs to be removed, and you can ask a nurse or doctor to do it.
Sweat, urine, and normal skin oils cause smells on the outside, not inside. That smell changes after a plain water wash. A true BV smell does not wash away.
Chlamydia and gonorrhea often cause no smell at all, but can change discharge or cause pain when you pee. Bleeding between periods or pain in the lower belly points that way too.
A smell like stool or gas coming from the vagina is rare and different. That can mean an abnormal opening between the bowel and the vagina. That always needs a doctor.
How to read the grades below
The options below come from our page on Bacterial Vaginosis. Each one carries two labels.
The first label is the evidence grade. A means strong trials in people, B means smaller or mixed studies, and C means early or limited findings. D means lab work only, and “insufficient” means the research cannot settle it yet.
The second label is the traditional tier. T3 means long use in more than one tradition, T2 means long use in one, and T1 means known use. T0 means no such record.
These grades come from research on Bacterial Vaginosis, the parent Health Topic, not on fishy smell down there.
A grade tells you how strong the research is, not how well something will work for you. Talk to a doctor or pharmacist before you start anything, above all if you take other medicines.
What to try first
Start by stopping the things that strip out good bacteria. Do not douche. Do not use scented washes, wipes, sprays, or deodorants inside.
Wash the outside with warm water only, once a day. Skip soap inside the lips of the vulva. Rinse and dry well.
Wear cotton underwear and change out of wet swimsuits or gym clothes. Skip tight, damp clothing for long hours. Change pads and tampons often.
Condoms can help, because semen shifts the acid balance. Some people notice fewer flare-ups when they use them for a few weeks.
Know that BV often needs prescription antibiotics to clear. That is the fastest and most reliable route, and it is a short course. Home options may support this, but they do not replace it, especially if you are pregnant.
From our graded list, these have been studied for BV. Curcumin has an evidence grade A and a traditional tier T0. Boric acid suppository has an evidence grade B and a traditional tier T0.
Probiotics (Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri) have an evidence grade B and a traditional tier T0. Women's Probiotic (vaginal strains) has an evidence grade B and a traditional tier T0.
These grades reflect research, not old folk custom. The T0 tier means there is no long traditional history behind them. Talk with a doctor, nurse, or pharmacist about form, dose, and timing before you start any of them.
Boric acid is for vaginal use only and is poisonous if swallowed. Keep it away from children. Do not use it if you are pregnant or might be.
How long it takes
If you take prescription antibiotics, the smell usually fades within two to three days. Finish the whole course anyway, even when you feel fine. Stopping early makes a return more likely.
Simple changes like stopping douching and scented washes can help within a week or two on their own. Mild cases sometimes settle without treatment. If nothing has changed after two weeks, get checked.
Boric acid suppository is usually used nightly for a set stretch of days, not open-ended. Probiotic approaches are slower and are often tried over several weeks. Ask a clinician how long to stay on anything.
Be ready for it to come back. Up to half of people get BV again within six to twelve months. A repeat visit is normal, not a failure.
