Yeast infections and bacterial vaginosis during menstruation

In short: Yes, periods can set off a yeast infection or bacterial vaginosis (BV) in some women. Blood changes the vagina's natural acidity, pads and tampons trap warmth and moisture, and hormone shifts affect your natural defences. A yeast infection usually means itching and thick white discharge, while BV often brings thin grey discharge with a fishy smell. See a gynaecologist if symptoms do not improve in a few days, keep coming back, or you are unsure which one it is.

Why down-there discomfort during your period might be more than just PMS

Periods are already tough. Cramps, bloating, fatigue... and now, throw in an itchy, irritated vagina? No, thank you! But for many women, it’s not uncommon to experience yeast infections or bacterial vaginosis (BV) during or around menstruation.

While both conditions are incredibly common, they’re often misunderstood, and the timing around your menstrual cycle can sometimes make things more confusing.

First things first: What is the difference?

Both yeast infections and bacterial vaginosis are vaginal infections, but they are caused by different things and require different treatments.

Yeast Infection

• Caused by an overgrowth of Candida, a type of yeast naturally found in the vagina.
• Common symptoms: thick, white discharge (like cottage cheese), itching, burning, redness, and swelling.
• Not sexually transmitted, but it can sometimes be triggered by hormones or poor hygiene.

Bacterial Vaginosis (BV)

• Caused by an imbalance of vaginal bacteria, where harmful bacteria outgrow the good ones.
• Common symptoms: thin, grayish-white discharge, a strong fishy odor, especially after sex, and mild irritation or burning.
• More common in sexually active women, but not considered a classic STI.

Why periods can trigger or worsen infections

Blood changes pH: This can encourage bacterial overgrowth. Tampons & pads trap moisture: Leading to a warm, damp environment that yeast loves. Hormones fluctuate, affecting your immune defenses and vaginal flora.

If you’re prone to yeast infections or BV, you may notice a pattern where symptoms appear or worsen every cycle.

Prevention tips to keep your vagina healthy during your period

While you cannot control every factor, small habits can help reduce your risk:

• Change pads and tampons often (every 4–6 hours).
• Use unscented products, no scented tampons, sprays, or wipes.
• Wear breathable cotton underwear to keep moisture down.
• Avoid douching; it disrupts your natural pH.
• Practice good hygiene, but don’t over-wash; plain water is often enough.

If you get recurrent infections, talk with your doctor about strategies to rebalance your vaginal flora.

Sometimes, self-care is not enough. See a healthcare professional if:

• Your symptoms are severe or don’t improve after a few days.
• You’re unsure whether it’s BV or a yeast infection.
• You experience pain in your lower abdomen.
• You notice sores, blisters, or fever.

Prompt treatment can relieve discomfort and prevent complications.

Questions women ask

Can your period cause a yeast infection?

It can make one more likely. Period blood changes the pH of the vagina, and a damp pad or tampon creates the warm, moist space yeast likes. Some women notice symptoms around the same time every cycle.

Can you get BV during your period?

Yes. Blood raises the vagina's pH, which can let unhelpful bacteria outgrow the good ones. BV usually causes thin, greyish discharge and a strong fishy smell, often worse after sex.

How do I tell a yeast infection from BV?

A yeast infection usually causes itching, burning, redness and thick white discharge like cottage cheese, with little smell. BV usually causes thin grey-white discharge with a fishy smell and only mild irritation. They need different treatment, so let a doctor confirm which one you have.

How can I prevent infections during my period?

Change pads or tampons every 4 to 6 hours, use unscented products, wear breathable cotton underwear and avoid douching. Wash the outside gently, plain water is often enough. If infections keep returning, talk to a gynaecologist.

When should I see a doctor for itching or discharge around my period?

See a doctor if symptoms are severe or not better after a few days, if this is your first time, or if they keep coming back. Go the same day if you have fever, pain in your lower tummy, or sores or blisters.