Heavy, smelly periods: what to know

Blood may smell metallic because of its iron content, and odour can become stronger when blood remains on a pad, tampon, or menstrual cup. A distinctly unpleasant or fishy smell, especially when it is new, may come from a vaginal infection or another condition affecting the vagina or cervix. Heavy bleeding can also occur for separate reasons such as fibroids, adenomyosis, polyps, hormone changes, or perimenopause. A retained tampon or other menstrual product needs prompt removal and assessment, particularly if there is fever or feeling unwell. Smell cannot identify the cause by itself.

A clinician may ask about discharge, itching, burning, pelvic pain, fever, sexual health, pregnancy possibility, products used, medicines, and the timing of the bleeding. Testing may include an examination or swabs, with blood tests or imaging when heavy bleeding needs further evaluation.

Change menstrual products regularly, wash the external genital area gently with water or mild unscented soap, and avoid douching, deodorant sprays, or fragranced products. Check whether a tampon or cup may have been left in place. Arrange a medical appointment for a new persistent odour, unusual discharge, itching, pain, or recurring heavy bleeding. Do not use leftover antibiotics or vaginal treatments without advice, because the cause may be different from a previous infection.

Seek urgent help for heavy bleeding with faintness, marked weakness, breathlessness, chest discomfort, confusion, or severe pelvic pain. Get prompt care for fever, vomiting, rapidly worsening pain, feeling very unwell, suspected pregnancy, or a retained menstrual product. These warning signs can indicate an infection or significant blood loss and should not be explained away as ordinary period odour.

Ask whether testing for infection is needed, whether the bleeding pattern suggests a uterine or hormonal cause, and whether blood count and iron tests are appropriate. Ask how to use menstrual products safely and which symptoms require urgent review.