Sour vaginal odour: what to know

The vagina has a natural microbial balance and mild odour can vary with sweat, sex, menstruation, semen, or changes in discharge. A sour or tangy smell may occur when vaginal acidity changes and does not automatically mean an infection.

A stronger or unfamiliar odour can accompany bacterial vaginosis, a sexually transmitted infection, a retained tampon, irritation from scented products, or another vaginal or pelvic condition. The smell alone cannot identify the cause. Notice discharge colour and texture, itching, burning, pain with urination or sex, bleeding after sex, and lower abdominal pain.

Wash the vulva gently with lukewarm water and a mild, unscented cleanser if needed; do not douche or put perfumes, deodorants, or antiseptics inside the vagina. Wear breathable underwear, change out of damp clothing, and avoid products that clearly irritate your skin.

Do not self-treat from odour alone with leftover antibiotics or internal washes. Arrange a sexual-health or gynaecology assessment if the change persists, returns, or comes with discharge or irritation. A clinician may examine you and take a swab so treatment matches the cause; antibiotic treatment for pelvic infection is used only when clinically appropriate.

Arrange prompt assessment for a new strong odour with unusual discharge, itching, burning, pelvic pain, pain during sex, or bleeding after sex. Seek urgent care for severe lower abdominal pain, fever, vomiting, faintness, or feeling acutely unwell. If you may be pregnant, mention this when seeking advice.

A retained tampon or other foreign object needs removal by a healthcare professional if you cannot remove it easily. Do not delay care because symptoms are mild: infections can sometimes cause few symptoms while still needing treatment.

Ask what causes fit your odour and other symptoms, whether you need a vaginal swab or sexually transmitted infection tests, and which products to stop. Ask whether a partner needs testing or treatment, how to use any prescribed medicine, and which warning signs should bring you back sooner.