Published on: 3/17/2025
A noticeable vaginal odor without extra discharge can come from normal bodily changes like hormone shifts or subtle variations in the natural bacteria.
The vagina keeps itself clean with natural fluids that sometimes have a faint odor. It is normal for this smell to change slightly during your menstrual cycle due to hormone shifts, which can also affect the mix of bacteria living there. Even if you don't see extra discharge, tiny amounts of natural secretion can mix with these bacteria, producing a noticeable odor. Sometimes, compounds like trimethylamine are made by the bacteria and give the area a fishy scent even without noticeable liquid. In many cases, this change in odor is normal and does not mean there is an infection or serious problem. However, if you also experience irritation, itching, or discomfort along with the odor, it might be a sign of an imbalance or infection, and talking with a healthcare provider would be a good idea. Keeping track of what is usual for your body helps you notice if something changes significantly over time.
(References)
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Doty RL, Ford M, Preti G, Huggins GR. Changes in the intensity and pleasantness of human vaginal odors during the menstrual cycle. Science. 1975 Dec 26;190(4221):1316-8. doi: 10.1126/science.1239080. PMID: 1239080.
Wolrath H, Borén H, Hallén A, Forsum U. Trimethylamine content in vaginal secretion and its relation to bacterial vaginosis. APMIS. 2002 Nov;110(11):819-24. doi: 10.1034/j.1600-0463.2002.1101108.x. PMID: 12588422.
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