The short answer: Period underwear is easier to start with: you put it on like normal underwear, it suits teenagers and nights, and there is nothing to insert. A menstrual cup holds flow for longer, needs emptying only every 8 to 12 hours depending on flow, works for swimming and costs very little over the years, but it takes a few cycles to learn. If you are unsure, start with period underwear, try a cup when you feel ready, and use the two together on heavy days.
How period underwear and menstrual cups work
These two products solve the same problem in opposite ways. One catches blood outside your body, the other collects it inside.
Period underwear
Period underwear, also called period panties, looks like ordinary underwear. The NHS describes it as pants made from absorbent fabric with a leak-resistant layer, which are washable and reusable. Fabpad reusable period panties have a built-in multi-layer absorbent core in soft cotton spandex and can be worn for up to 8 hours depending on flow. After use you rinse, wash and dry them.
Menstrual cup
A menstrual cup is a small, flexible cup, usually made of silicone, that you fold and insert into the vagina. It opens up and sits low in the vaginal canal, forming a gentle seal. Blood collects in the cup rather than being absorbed. You take it out, empty it into the toilet, rinse it and put it back.
Side-by-side comparison
| What matters | Period underwear | Menstrual cup |
|---|---|---|
| Where it sits | Outside, worn like underwear | Inside the vagina |
| Wear time | Up to 8 hours depending on flow | Empty every 8 to 12 hours depending on flow |
| Learning curve | Almost none | Usually a few cycles |
| Heavy days | Choose high-waist or boy shorts, change sooner | Empty more often |
| Swimming | Not designed for it | Works well |
| Care | Rinse, wash gently, dry in the shade | Rinse during your cycle, boil before first use and after your cycle |
| How many you need | Several pairs for a full cycle | One cup |
| Safety points | Change on time, dry fully before reuse | Rare TSS risk; check with your doctor if you have an IUD |
Comfort: which feels better?
Period underwear feels the most familiar. There is nothing to insert and nothing to stick, so it suits anyone who feels uneasy about internal products. Many people like that it does not rustle or bunch the way a pad can. Cleveland Clinic notes it may help if pads irritate your skin.
The trade-off is that the gusset, the part between your legs, is thicker than normal underwear. On a hot day in Hyderabad or Chennai, or during a humid monsoon week, some people notice the extra warmth, especially on heavy days when the panty is holding more.
A cup, once it is in the right place, usually cannot be felt at all. Your skin stays dry because nothing wet is touching it, which some people find makes a big difference in summer. The catch is the learning phase. If the cup sits too high, too low or has not opened fully, it can feel uncomfortable or leak. Most people find it gets easier after a few cycles.
Leak protection on light, medium and heavy days
A 2019 review in The Lancet Public Health found that leakage with menstrual cups was similar to or lower than with disposable pads or tampons, in the studies that compared them directly. The authors noted that more good-quality studies are needed.
Period underwear holds a set amount before it needs changing. Cleveland Clinic says period underwear typically holds somewhere between one and two tampons' worth of flow, varying by brand, and that you should change more often on heavy days. On light and medium days most people wear it alone. On heavy days, a high-waist period panty or period boy shorts give more coverage. Our guide to high-waist vs mid-rise period panties helps you choose.
Cup leaks usually come from the seal, not from overflow. If the cup has not opened fully, is the wrong size, or is full, you may notice spotting. That is why many people wear a period panty or liner as backup while they learn.
Ease of use and the learning curve
Getting started with period underwear
Choose your size from the size chart, put it on in the morning and change as needed. That is it. For a first cycle, wear it on a day at home so you can see how long it lasts on your flow. Teenagers can start as soon as their periods begin, which our guide on the right age to start period panties explains.
Getting started with a cup
A cup needs a little practice. Start on a lighter day, at home, when you are relaxed.
- Wash your hands well with soap and water.
- Fold the cup, for example into a C shape, so the rim is small.
- Sit, squat or stand with one leg up, and gently insert the folded cup, aiming towards your lower back rather than straight up.
- Let it open. Run a finger around the base or turn it slightly to check it has opened fully.
- To remove, relax your muscles, reach for the base and pinch it to break the seal. Then ease it out gently, keeping it upright so it does not spill. Never pull straight out by the stem without breaking the seal first.
- Empty into the toilet, rinse with water and reinsert.
Choosing a cup size
The Fabpad Reusable Menstrual Cup comes in Teen (18 years and below), Small (18 and above) and Large (30 and above, or after a vaginal birth). If you are unsure or between sizes, choose Small.
Hygiene and safety
Period underwear
Do not wear one pair for longer than about 8 hours, and change sooner on heavy days. Rinse in cold water until it runs clear, wash gently with mild detergent by hand or on a gentle cycle in a wash bag, and air-dry in the shade. Avoid hot water, bleach and fabric softener, and do not tumble dry or iron. Make sure each pair is fully dry before wearing again. Our guide on how to wash period panties covers this step by step.
Menstrual cup
Wash your hands before inserting and removing. Rinse the cup with water each time you empty it during your cycle. Sterilise it in boiling water for 3 to 5 minutes before first use and after your cycle ends, then store it dry in its pouch. Fabpad suggests replacing the cup every 3 to 5 years depending on its condition.
Two safety points matter:
- Toxic shock syndrome (TSS): a rare but serious infection. The Lancet review found a small number of reported cases after cup use. The NHS advises not leaving a cup in longer than recommended and following the instructions.
- IUD users: if you have a copper or hormonal coil, check with your doctor before using a cup. The same review found reports of IUDs being dislodged in cup users, so your doctor may advise on how to remove the cup carefully.
Cost over two years: an illustrative example
These are round assumed prices for comparison only. They are not Fabpad's prices.
- Period underwear: if one pair costs about ₹700 and you buy four so you always have a dry one, that is about ₹2,800 once, plus detergent. Cleveland Clinic says most pairs last two to five years depending on quality and washing.
- Menstrual cup: if a cup costs about ₹500, that is ₹500 once. Many people also buy a few liners or a period panty as backup.
- For comparison, disposable pads: if you use about 20 pads a cycle at around ₹8 each, 26 cycles over two years come to about ₹4,160.
The cup is the cheapest option over time. Period underwear costs more upfront but still works out cheaper than buying disposables every month. On fabpad.in, buying more pairs of period panties gives a bigger discount.
School, work, travel and swimming
At school: Period underwear is often easier for younger teens. There is nothing to change in a crowded toilet between classes, and a spare pair in a zip pouch covers emergencies. Some older teens prefer a cup once they are confident. See our tips for periods at school.
At work: A cup can last a full office day, including a long commute. Period underwear works too, though on heavy days you may need to change during the day and carry the used pair home in a bag.
Travel: A cup needs only clean water to rinse and a clean toilet, which can be hard on trains or highways. Period underwear needs washing and drying, which is tricky on the move. Many travellers use a cup with a period panty as backup, or switch to disposable period panties for the trip.
Swimming: The cup is clearly the better choice. Standard period underwear is not designed for the pool.
Who each one suits
Period underwear may suit you if
- you have just started your periods or feel unsure about inserting anything
- you want an easy option for nights
- pads irritate your skin
- you have an IUD and have not yet spoken to your doctor about cups
- you want backup for a cup or tampon
A menstrual cup may suit you if
- you swim, play sport or have long days with few washroom breaks
- you are comfortable with internal products
- you want the lowest running cost
- you are happy to spend a few cycles learning
Using both together
Many people use both: the cup as main protection, the period panty to catch small leaks while learning or on the heaviest day. A period panty in a Mid Waist style works well as everyday backup.
See a doctor if
- you need to empty your cup or change your period panty much more often than advised, which the NHS lists as a sign of heavy periods
- you cannot remove your cup after relaxing and trying again
- you have pain using a cup that does not settle after you adjust it
- you have an IUD and want to start using a cup
- you notice itching, soreness or unusual discharge
Get urgent help if
If you develop a high temperature, a raised rash that feels like sandpaper, vomiting, diarrhoea, confusion or difficulty breathing while using a cup, remove it and call 112 or 108, or go to the nearest hospital emergency department. Tell the doctor you were using a menstrual cup.
Frequently asked questions
Is a menstrual cup better than period underwear? Neither is better for everyone. A cup lasts longer between changes and suits swimming. Period underwear is easier to use and needs no insertion.
Can a virgin use a menstrual cup? Yes. Using a cup does not affect virginity. Start with a teen or small size and take your time.
Can I sleep with a menstrual cup? Yes, if you empty it within the recommended time. Fabpad's cup is emptied every 8 to 12 hours depending on flow.
Can period underwear replace a cup on heavy days? For many people, yes, with a high-waist or boy shorts style and more frequent changes. If you are soaking through every one to two hours, see a doctor.
Can a menstrual cup get lost inside me? No. The vagina ends at the cervix, so the cup cannot go further. If it moves up, relax, squat and bear down gently to bring it lower.
How many period panties do I need if I also use a cup? Two or three as backup is usually enough. Read how many period panties you need for more.
Related reading
- Reusable vs Disposable Period Products: Cost, Comfort and Convenience Compared
- Tampons vs Period Panties: Which Is Right for You?
- Period Panties for Heavy Flow: How They Work and How to Choose
- Period Panties for Sleep: How to Stay Leak-Free All Night
This article is for general information and doesn't replace advice from your doctor.
Sources: NHS: Periods, NHS: Toxic shock syndrome, The Lancet Public Health: Menstrual cup use, leakage, acceptability, safety, and availability: a systematic review and meta-analysis, Cleveland Clinic: What Is Period Underwear and Does It Work?, NHS: Heavy periods