Why does my vaginal discharge have an ammonia-like smell?

Reviewed by Yoshinori Abe, MD

Internal Medicine

An ammonia-like smell in vaginal discharge is typically caused by a disruption in the natural balance of vaginal bacteria. The most common cause is bacterial vaginosis (BV), but other factors like dehydration, urine residue, sweat, or trichomoniasis can also produce a strong, ammonia-like odor. While occasional mild changes in scent are normal, a persistent chemical smell often signals that something needs attention.

Because the underlying cause can range from simple hydration issues to infections that require treatment, it's important to identify what's driving the symptom rather than guess. Taking a free, instant, online symptom check can help you understand possible causes based on your specific symptoms and guide you on the best next steps—whether that's a home remedy, a call to your doctor, or a visit to a clinic.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Your vagina naturally has a mix of good bacteria that keep the area healthy. When this balance changes, it can cause the discharge to smell different.

One reason for an ammonia-like odor is that certain bacteria can produce chemicals like ammonia as they grow. Bacterial vaginosis is a common condition where the usual healthy bacteria decline, and other bacteria take over. These bacteria release amines (including ammonia), which make the discharge smell stronger or like ammonia.

Stress and other factors may also change the balance of bacteria. This odor is a sign that something might be off, even if you do not see extra discharge or experience discomfort. If you're experiencing these changes, you can check your symptoms to better understand what might be causing them and when to seek care. Remember, keeping track of how your body changes helps you stay healthy.

(References)

Hay PE. Bacterial Vaginosis as a Mixed Infection. In: Brogden KA, Guthmiller JM, editors. Polymicrobial Diseases. Washington (DC): ASM Press; 2002. Chapter 7.
Nansel TR, Riggs MA, Yu KF, Andrews WW, Schwebke JR, Klebanoff MA. The association of psychosocial stress and bacterial vaginosis in a longitudinal cohort. Am J Obstet Gynecol. 2006 Feb;194(2):381-6. doi: 10.1016/j.ajog.2005.07.047. PMID: 16458633; PMCID: PMC2367104.
Mogilnicka I, Bogucki P, Ufnal M. Microbiota and Malodor-Etiology and Management. Int J Mol Sci. 2020 Apr 20;21(8):2886. doi: 10.3390/ijms21082886. PMID: 32326126; PMCID: PMC7215946.

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