Menstrual hygiene is the set of practices that keep your body clean, comfortable, and infection-free during your period. It covers choosing and changing menstrual products at safe intervals, washing the vulvar area properly, and having access to clean water, private facilities, and accurate information. The World Health Organization frames this within a broader concept of “menstrual health,” defined as a state of complete physical, mental, and social well-being in relation to the menstrual cycle.
Why Menstrual Hygiene Matters
Your vagina maintains a naturally acidic environment (around pH 4.2 at mid-cycle) that keeps harmful bacteria in check. During menstruation, blood raises that pH significantly, reaching about 6.6 on the heaviest days before gradually dropping back down. This temporary shift makes the vaginal environment more hospitable to bacteria, which is why keeping things clean during your period is more than a comfort issue.
Poor menstrual hygiene has a strong association with bacterial vaginosis, the most common reproductive tract infection. It occurs when protective bacteria decline and other organisms overgrow. Damp, unchanged products create exactly the conditions these bacteria thrive in: warmth, moisture, and a less acidic pH. Urinary tract infections, yeast infections, and skin irritation are also more likely when products are worn too long or when harsh cleansers disrupt the body’s natural balance.
Changing Products at the Right Intervals
The single most important menstrual hygiene habit is changing your product regularly. Trapped moisture is a breeding ground for bacteria and fungi, regardless of how light your flow is. Here are the recommended intervals:
- Tampons: Every 4 to 8 hours. Never exceed 8 hours. If a single tampon lasts the full 8 hours, you may be using a higher absorbency than you need, which increases irritation and the risk of toxic shock syndrome (TSS).
- Pads: Every few hours, even on light days. On heavy days, check and change more frequently.
- Menstrual cups and discs: Can typically be worn up to 12 hours, depending on the brand and your flow, then emptied, rinsed, and reinserted.
- Period underwear: Change when they feel damp or at least every 8 to 12 hours.
The FDA specifically advises using the lowest absorbency tampon that handles your flow. A product that’s more absorbent than necessary dries out vaginal tissue, which can cause micro-tears and increase infection risk.
Comparing Menstrual Products
Different products hold different amounts of blood, which affects how often you need to change them and which ones suit your flow. A 2024 study measuring actual blood capacity found that regular tampons hold about 20 mL, while heavy-absorbency tampons hold 31 to 34 mL. Pads vary widely: a light-day pad holds roughly 4 mL, while heavy-day pads range from 31 to 52 mL depending on the brand. Menstrual cups hold 22 to 35 mL depending on size, and menstrual discs had the highest average capacity at 61 mL. Period underwear held the least at around 2 mL.
For context, the average person loses about 30 to 40 mL of blood over an entire period. That means a single menstrual disc could theoretically hold nearly two days’ worth of flow, while period underwear works better as backup protection or for very light days. Choosing the right product for your flow level helps you stay comfortable and reduces the chance of leaks or prolonged moisture against the skin.
Cleaning Your Body During Your Period
Warm water is all you need to clean the vulva (the external genital area) during menstruation. The vagina itself is self-cleaning and should never be washed internally with soap, douches, or any other product. Scented feminine hygiene products, including scented pads and wipes, are a common cause of vulvar dermatitis, a condition that causes itching, redness, and irritation.
If you prefer using some kind of cleanser externally, choose a mild, fragrance-free soap and apply it only to the outer skin. Pat the area dry with a clean towel rather than rubbing. Wearing 100% cotton underwear and loose-fitting clothing helps air circulate and reduces moisture buildup. Synthetic fabrics and tight jeans trap heat against the skin, which can worsen irritation during your period. Washing your clothes and underwear with unscented detergent also reduces the chance of a reaction.
Caring for Reusable Products
Menstrual cups and discs need to be sanitized between cycles. The standard method is boiling them in water for 5 minutes at the end of each period before storing them. During your period, rinsing with clean water between insertions is sufficient. You don’t need to sterilize a cup in the clinical sense (eliminating every possible microorganism). Sanitizing, which reduces bacteria to a safe level, is the goal.
Avoid boiling for longer than necessary or leaving the cup unattended in the pot. Extended or repeated over-boiling can degrade the medical-grade silicone over time. Store your cup or disc in a breathable cotton pouch, not a sealed plastic bag, so moisture doesn’t get trapped.
Toxic Shock Syndrome
TSS is a rare but serious bacterial infection most commonly linked to tampons left in place too long. Anything that stays in the vagina beyond the recommended time increases the risk. Symptoms come on suddenly and include a high fever, a sunburn-like rash, vomiting, diarrhea, muscle aches, and a drop in blood pressure. It can progress quickly and requires emergency medical care.
Reducing your risk is straightforward: change tampons every 4 to 8 hours, use the lowest absorbency you need, and only use tampons when you actually have your period. Alternating between tampons and pads, especially overnight, is another way to limit continuous internal use.
Access Remains a Global Problem
Menstrual hygiene isn’t just about knowing the right practices. It requires access to products, clean water, and private spaces, which millions of people still lack. A 2024 WHO report found that fewer than 1 in 3 schools worldwide have bins for menstrual waste in girls’ toilets. In sub-Saharan Africa, that number drops to just 1 in 10. Many adolescent girls don’t have access to a clean toilet or any private space to change menstrual products at school, and unequal access to water and soap compounds the problem.
This lack of infrastructure forces people to use products for too long, improvise with unsuitable materials, or skip school entirely during their periods. Period poverty, the inability to afford or access menstrual products, affects communities in both low-income and high-income countries and has direct consequences for reproductive health, education, and daily life.