Fishy odor is generally caused by bacterial vaginosis, perspiration, or trichomoniasis, but sometimes it may also indicate something more serious like a rectovaginal fistula. Whatever the cause, it’s important to see your gynecologist to get a proper diagnosis and treatment for it. This link: https://getflowerpower.com/blogs/news/home-remedies-for-vaginal-odor

Sweat – Your vagina has apocrine sweat glands, much like your armpits and eyelids. Your thighs frequently touch each other, and this can lead to excess sweat in your vagina, which can lead to an odor and a discharge that smells fishy or foul.

Hormone imbalances – For women who are pregnant or menopausal, the body may not produce enough estrogen. When the estrogen level is too low, it can result in a fishy odor and spotting after sex.

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Trichomoniasis – A sexually transmitted infection (STI) that can cause frothy, yellowish-green discharge with a fishy smell.

STIs can be spread from person to person through unprotected sexual contact, so make sure you’re washing your hands before and after you engage in sex.

Bacterial vaginosis

A common cause of fishy odor in your vagina is bacterial vaginosis, an overgrowth of bacteria that disrupts the natural flora of your vagina. You can get treated for this condition with oral antibiotics or by inserting them into your vagina. However, you may need to be on a treatment plan for a while because the infection can recur.