Is Vaginal Odour Normal?

A Guide to What's Healthy and What to Watch For

What Does Normal Vaginal Odour Smell Like?

Normal vaginal odour is mildly musky, slightly tangy, or sour-milky. It changes across the menstrual cycle, after sex, during pregnancy, and in response to diet and stress.

A healthy vaginal pH sits between 3.8 and 4.5 — maintained by Lactobacillus bacteria, which give the vagina its characteristic mild acidity. A strong fishy, rotten, or unusually sweet smell, particularly alongside discharge changes or itching, warrants medical attention.

Key Things to Know About Vaginal Odour

• Normal vaginal odour is mild, slightly acidic, and varies throughout the cycle
• Healthy vaginal pH is 3.8–4.5; disruption to this balance is the most common cause of odour changes
• Bacterial vaginosis (BV) affects approximately 1 in 3 women of reproductive age globally (WHO) and is the most frequent cause of abnormal vaginal odour
• Scented soaps, douching, and synthetic underwear all disrupt bacterial balance
• The vagina is self-cleaning and requires no internal washing

What Causes Vaginal Odour to Change?

Odour shifts are driven by changes in vaginal pH and bacterial balance. Common triggers:

After sex: semen has a pH of 7.2–8.0, temporarily raising vaginal acidity and altering smell. This usually resolves within a few hours.

Before and during a period: the presence of blood raises pH slightly, producing a faint metallic scent. Normal and temporary.

During pregnancy: elevated oestrogen increases vaginal discharge and can intensify natural odour. Unless accompanied by itching or unusual discharge colour, this is expected.

After exercise: sweat mixing with natural fluids produces a stronger scent. Showering and changing into cotton underwear resolves this.

Diet: foods such as garlic, onion, and asparagus temporarily affect bodily secretions including vaginal fluids.

When Does Vaginal Odour Signal a Problem?

Smell

Possible Cause

Other Signs

Fishy or rotten

Bacterial vaginosis (BV)

Grey or white thin discharge

Yeasty or sweet

Yeast infection

Thick white discharge, itching

Foul with green or yellow discharge

Possible STI or infection

Irritation, pelvic discomfort

Metallic

Blood present — menstruation or spotting

Timing aligns with cycle

BV is the most common vaginal infection in women aged 15–44 and is caused by an overgrowth of anaerobic bacteria displacing Lactobacillus. It is straightforward to diagnose and treat — delaying assessment prolongs discomfort unnecessarily.

What Not to Do

• Douching flushes out Lactobacillus and raises BV risk significantly
• Scented soaps or sprays near the vulva disrupt pH and irritate tissue
• Synthetic or tight underwear traps heat and moisture, creating conditions for bacterial overgrowth
• Daily panty liners worn continuously have the same effect

What Supports a Healthy Vaginal Environment

• Wash the external vulva with warm water only
• Wear breathable cotton underwear
• Include probiotic-rich foods — yogurt, kefir, fermented vegetables — to support Lactobacillus populations
• Stay well hydrated
• Track odour changes alongside your cycle to establish your personal baseline

When to See a Doctor

Speak with a healthcare provider if you notice:

• A fishy or rotten smell persisting for more than two to three days
• Any odour change accompanied by unusual discharge colour, itching, or burning
• Recurrent episodes that keep returning after resolving

The Eshe AI assistant is available in-app to help you assess your symptoms and decide whether to seek care.