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Published on: 8/20/2026
A fishy vaginal odor is most commonly a sign of bacterial vaginosis (BV), a condition caused by an imbalance of bacteria in the vagina. BV is the most frequent vaginal infection in women ages 15–44 and often requires prescription treatment to fully resolve. Other possible causes include trichomoniasis or retained foreign objects, so accurate evaluation matters.
Because a fishy smell rarely goes away on its own and can signal an underlying infection, it's important to identify what's actually causing it before symptoms worsen or spread. A fast, free way to get clarity is to take an online symptom check—it uses your specific symptoms to suggest possible conditions and guide your next steps, so you can walk into your appointment informed and get the right treatment sooner.
Reviewed for medical accuracy: 07/15/2026
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If your vagina smells like fish, it might be due to a common infection called bacterial vaginosis. In this condition, the balance of bacteria in your vagina changes, leading to the production of a substance called trimethylamine that gives off a fishy odor. First, notice if you have any other symptoms like itching, burning, or unusual discharge. Keeping the area clean with warm water is okay, but avoid harsh soaps or douches that could further disturb the natural balance of bacteria. To help identify what might be causing your symptoms, you can start by taking a free symptom checker test that asks about your specific concerns. The best next step is to contact a healthcare provider who can properly examine you, perform necessary tests, and determine if bacterial vaginosis or another condition is present. If it is bacterial vaginosis, your provider might recommend antibiotics, which help restore the normal balance of bacteria. Taking care of these symptoms early helps prevent any complications and keeps you healthy.
(References)
Brand JM, Galask RP. Trimethylamine: the substance mainly responsible for the fishy odor often associated with bacterial vaginosis. Obstet Gynecol. 1986 Nov;68(5):682-5. PMID: 3763085.
Li M, Al-Sarraf A, Sinclair G, Frohlich J. Fish odour syndrome. CMAJ. 2011 May 17;183(8):929-31. doi: 10.1503/cmaj.100642. Epub 2011 Mar 21. PMID: 21422137; PMCID: PMC3091902.
Updated 2024 May 6]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK459216/
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