Vaginal Odor Causes: Fishy, Sour, Metallic and Other Smells Explained
Written by Cherlie Joseph, MSN, FNP-BC · Medically reviewed by Naurah Gaspard, DNP, FNP-C, FNP-BC · Updated November 2026
A mild, slightly sour or musky smell is normal. A strong fishy odor, especially after sex, is most often bacterial vaginosis (BV) or sometimes trichomoniasis, while a very foul or rotten smell can mean a forgotten tampon. Odor with itching, burning, unusual discharge or pelvic pain should be checked.
In this guide
What is a normal vaginal smell?
Every vagina has a scent. Healthy vaginal bacteria (mostly lactobacilli) make lactic acid, so a mild tangy or sour smell is normal. Your scent can change through your cycle, after exercise, after sex, and with pregnancy or menopause. Normal discharge is clear or white and should not have a strong or bad smell, according to Cleveland Clinic. What matters most is a change from what is usual for you, especially when it comes with other symptoms.
Common odors and what they may mean
| Smell | Possible cause | Other clues |
|---|---|---|
| Fishy | Bacterial vaginosis (most common); trichomoniasis | Thin gray-white discharge, stronger after sex or during periods. Trich may add itching, soreness and yellow-green discharge. |
| Tangy or sour | Normal lactobacilli | No itching or pain. Usually nothing to treat. |
| Metallic or coppery | Blood from a period or light spotting after sex | Bleeding between periods or after menopause should be checked. |
| Rotten or very foul | Forgotten tampon, cup or condom | Often brown or dark discharge. Remove it and get seen promptly. |
| Bread or yeast-like | Yeast infection (often little or no odor) | Itching, burning and thick white discharge. |
| Sweaty or musky | Sweat glands in the groin, tight clothing | Improves with washing and breathable fabric. |
| Ammonia or bleach-like | Urine on skin or underwear; dehydration | Burning with urination may mean a UTI. |
Odor that is new or will not go away?
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Start a BV visit →Why BV is the top cause of fishy odor
In BV, protective lactobacilli drop and other bacteria overgrow. Those bacteria release compounds called amines, and they become more noticeable when vaginal pH rises, such as after unprotected sex (semen is alkaline) or during a period. That is why many people notice a fishy smell right after sex. Clinicians even use this: a fishy smell when a drop of potassium hydroxide is added to discharge, called the whiff test, is one of the CDC criteria for diagnosing BV.
Trichomoniasis, a common and curable STI, can also cause a fishy odor. The CDC estimates about 70% of people with trich have no symptoms, so testing is the only way to know. Because both conditions are treated with prescription medicine, it is worth getting the right diagnosis rather than guessing.
What not to do
- Do not douche or use scented sprays or wipes. They mask odor briefly but disrupt healthy bacteria and are linked with BV.
- Do not treat a fishy smell with yeast medicine. Over-the-counter antifungals do not treat BV or trich.
- Do not insert garlic, vinegar, tea tree oil or yogurt. These are not proven and can irritate tissue.
Helpful habits include washing the vulva with water or a mild unscented soap, wearing cotton underwear, changing out of sweaty or wet clothes, using condoms with new partners, and changing tampons and pads regularly.
When to see a provider
Get checked if an odor is new, strong or keeps coming back; if you also have itching, burning, sores, pain with sex or unusual discharge; if a partner has an STI; or if you are pregnant. A visit usually covers your symptoms and history, and your provider may recommend a vaginal swab or STI test. If BV is likely, treatment is typically metronidazole or clindamycin. If you have had several episodes, ask about options for recurrent BV.
Get in-person care or call 911 if you have:
- Fever, chills or pelvic pain along with odor
- A foul smell from a tampon or object you cannot remove
- Bleeding after menopause or heavy bleeding outside your period
- Discharge, odor or bleeding during pregnancy
Frequently asked questions
Why does my vagina smell fishy after sex?
Semen raises vaginal pH for a while, which can make BV-related odor stronger. A brief mild change can be normal, but a fishy smell that keeps coming back after sex is a common sign of BV and is worth checking.
Is it normal to have a vaginal smell every day?
Yes. A mild, slightly sour or musky scent is normal and changes through your cycle. A strong, fishy or foul odor, or odor with itching or unusual discharge, is not typical.
Can a UTI cause vaginal odor?
A UTI can make urine smell strong or cloudy, which some people notice as an odor near the vagina. Burning with urination and needing to go often point toward a UTI rather than a vaginal infection.
Sources
- CDC: Bacterial Vaginosis, STI Treatment Guidelines
- CDC: About Trichomoniasis
- Cleveland Clinic: Vaginal Discharge
Keep reading
- What causes BV?
- Yeast infection vs BV
- UTI symptoms in women
- Browse all conditions and treatments A to Z
Odor that is new or will not go away?
$79 visit, no appointment needed. Adults 18+ in FL, NM, OR and WA.
Start a BV visit →
Cherlie Joseph, MSN, FNP-BC
Board-certified family nurse practitioner licensed in Florida, caring for adults online at OurTopClinic. Meet our providers.
This article is for general education and is not a substitute for medical advice. Treatment, including any prescription, is decided by a licensed provider after reviewing your health history. OurTopClinic is not for emergencies; if you have a medical emergency, call 911. OurTopClinic serves adults located in Florida, New Mexico, Oregon and Washington. Learn more at ourtopclinic.com.
