Period Pants vs Tampons

Can period pants replace tampons?

Yes, on most days of most periods, and on the heaviest days a lot of people run the two together rather than choosing. Tampons are discreet, cheap per unit and the product you can swim in. Period pants ask nothing of your body beyond putting them on.

How do tampons and period pants work differently?

A tampon absorbs blood inside the vagina before it leaves the body, and comes out by its string within 8 hours; period pants absorb blood after it leaves, in layers built into the gusset, and are changed when they feel damp. The NHS periods page notes that a tampon inserted properly shouldn’t be felt and can’t get lost inside you.

Because a tampon sits internally, the rules around it are stricter. The Brand A UK leaflet says to use the lowest absorbency that copes with your flow, never wear two at once, never use one when you’re not bleeding, and remove the last one at the end of your period.

Period pants have no equivalent rule book. Annahitah’s pants wick moisture through a top layer into absorbent middle layers, with a leak-resistant layer underneath. You wear them, rinse them in cold water, wash them at 30°C and wear them again.

What is TSS and why does tampon wear time matter?

Toxic shock syndrome is a rare but serious bacterial infection that the NHS says can come on quickly and needs urgent treatment, and tampon guidance ties the risk to leaving one in too long or using a higher absorbency than you need. The Brand A leaflet says around half of all TSS cases occur in menstruating females; the NHS notes that after a previous bout of TSS a doctor may advise against tampons.

What are the NHS warning signs?

The NHS lists a high temperature or feeling hot, cold or shivery, muscle aches, a raised rash that feels rough like sandpaper, and flu-like symptoms. Call 999 or go to A&E for confusion, blue, grey, pale or blotchy skin or lips, a rash that doesn’t fade under a glass, difficulty breathing, or large areas of peeling skin. Use NHS 111 for a fever with aches, vomiting and diarrhoea, severe pain, a sandpaper rash, bright red palms, soles, tongue or eye whites, swollen or peeling skin, or dizziness.

If you’re wearing a tampon or cup when symptoms start, remove it and tell 111 you were.

How do you lower the risk?

Follow the leaflet. The Brand A UK guidance is to change every 4-8 hours, use the lowest absorbency for your flow, insert a fresh tampon before bed and change it as soon as you wake, switch to a pad or liner from time to time, and wash your hands before and after. The NHS adds: don’t leave tampons or cups in longer than needed or recommended, and remove one if symptoms appear.

Period pants aren’t a treatment for anything and we’re not suggesting tampons are dangerous when used as directed. The relevant point is that pants give you a way to take the “switch to a pad or liner from time to time” advice without a pad.

Which holds more, a tampon or period pants?

A regular tampon held about 20 ml of blood and a heavy tampon 31-34 ml in a 2023 lab study, while UK period pants are labelled by how many tampons’ worth they hold, with Annahitah’s Super Heavy styles rated at 6-8. The study, published in BMJ Sexual & Reproductive Health, tested 21 products with expired human red blood cells rather than the water or saline most manufacturers use, and the authors noted the two methods give different results.

That study also tested one US brand of “super” period underwear and found it held 1-3 ml of blood, far below its label. Treat that as what it is: one brand, three pairs, one lab, and a finding that conflicts with every UK brand’s claim. It says nothing about Annahitah, which wasn’t tested. It does justify asking any brand how it measures capacity.

Which? ran its own test in July 2026 with water and found heavy pants from the brands it tested held roughly 4 to 12 regular tampon equivalents, with the best pairs lasting a full day without leaks and the worst leaking after four hours. Annahitah’s Super Heavy styles (Shanti, Odessa, Valentina and Athena) are rated at 6-8 tampons’ worth; Heavy and Medium styles (Serendipity, Lilah, Luna and Gaia) at 3-5 per wear.

Which is better overnight?

Period pants, because a tampon should come out within 8 hours even while you sleep, and a full night plus getting up is longer than that for many people. The Brand A leaflet’s answer is a fresh tampon at bedtime and a change on waking; that works if your night is short.

Annahitah’s Super Heavy styles are designed for extended wear and overnight protection. The brand’s own routine for a heavy day is a Super Heavy pair through the day and a second Super Heavy pair for the night. There’s no alarm to set and nothing to remember at 3am. Sleeping positions and mattress protection are covered in our overnight guide.

Which suits swimming, sport, teens and coil users?

Tampons are the only one of the two you can swim in, period pants need no insertion so suit first periods, both work for sport on land, and anyone with a coil should ask their fitter about any internal product.

Which is better for swimming?

Tampons, every time. Period pants aren’t designed for the water, and Annahitah doesn’t make swimwear yet.

Which is better for sport on land?

Both. Tampons are what many runners and gym-goers have always used. Annahitah says its pants support all types of exercise, and its Nirvana and Venus G-strings are cut to disappear under tight gym kit.

Which suits teens and first periods?

Pants or pads, because nothing needs inserting. Brand B’s tween guide notes that tampons can feel intimidating at first. Annahitah’s Valentina style starts at XXXS (UK 2-4).

What should coil (IUD) users know?

Ask the person who fitted it. SH:24, an NHS-commissioned sexual health service, says there isn’t enough evidence that tampons increase the chance of a coil being expelled, and that some people are advised to avoid tampons and cups for a few weeks after fitting. Period pants have nothing to pull on, so the question doesn’t arise.

Which costs less and creates less waste?

Tampons look cheap at 2-13p each but, together with pads, added up to about £192 over two years in Which?’s May 2022 costing, against about £96 for eight pairs of period pants over the same period. Own-brand supermarket tampons were 2-4p each and branded ones 10-13p. Which? put the break-even point for pants at about six months of exclusive use, and since 1 January 2024 reusable period underwear has carried no VAT in the UK.

On waste, City to Sea estimated in 2019 that 2.5 million tampons are flushed in the UK every day, and that period products are the fifth most common item found on European beaches. Annahitah’s founder, Nina Alexander, has said she started the brand after hearing that a tampon can take about 800 years to decompose; that’s her account of what moved her rather than a figure we’ve verified. B Lab’s profile of Annahitah records that the brand kept more than 120,000 tampons out of landfill in its first year.

Prices have moved since 2022, so take the Which? numbers as the shape of the saving rather than a quote.

How do you wear a tampon and period pants together on heavy days?

Insert the tampon as usual, wear Medium or Heavy period pants over it instead of a pad, and let the pants catch anything that gets past the tampon when it fills before you can change it. Brand C and Brand B both describe this pairing; Brand B suggests a tampon or cup by day and pants alone at night.

A routine that works for a lot of people:

1. Morning of the heaviest day: tampon at the lowest absorbency that copes, plus Heavy pants. 2. Change the tampon within 4-8 hours as the leaflet says; the pants stay on unless they feel damp. 3. Evening: take the last tampon out, change into Super Heavy pants for the night. 4. Day two onwards: pants alone if the flow allows, tampon back in for swimming or a long day out.

If you’d rather go without tampons altogether on heavy days, Annahitah’s Super Heavy collection is where that starts: tampon-free heavy flow pants rated at 6-8 tampons’ worth, worn through the day and swapped for a second pair at night.