Change a tampon every 4 to 8 hours and never leave one in for more than 8. Use the lowest absorbency that handles your flow, wash your hands before and after, and switch to a pad or another product overnight if you sleep longer than eight hours. Those four habits carry almost all of the safety.
- Change every 4 to 8 hours. The FDA is explicit: "Change each tampon every 4 to 8 hours. Never wear a single tampon for more than 8 hours at a time."
- Use the lowest absorbency that works. The FDA offers a simple check for this: "If you can wear one tampon up to eight hours without changing it, the absorbency may be too high."
- Wash your hands before and after. In the FDA's words, doing so "will help reduce the spread of bacteria".
- One at a time, and only while you are bleeding. Doubling up, or inserting one in anticipation of a period, works against the lowest-absorbency rule rather than with it.
Tampons are not an unregulated consumer good, which is worth knowing because it explains why the labels behave the way they do. As the FDA notes, "You may be surprised to learn that the FDA regulates tampons as medical devices." That is also why the absorbency wording on the box is set by federal rule instead of by marketing departments.
Which tampon absorbency should you use?
Absorbency is not a physical size. It is a measured quantity of fluid the tampon holds, and the terms are fixed so that the same word means the same thing on every brand's box. The ranges below are the ones set in the FDA tampon labelling rule, 21 CFR 801.430.
| Label on the box | Absorbency | Generally suits |
|---|---|---|
| Light | 6 g and under | Spotting and the lightest days |
| Regular | 6–9 g | Light to moderate flow |
| Super | 9–12 g | Moderate to heavy flow |
| Super plus | 12–15 g | Heavy flow |
| Ultra | 15–18 g | The heaviest days |
Above 18 grams, the rule permits no absorbency term at all, which is why you will not see anything marketed beyond ultra. Expect to move between absorbencies within a single period, because your flow moves too. Reaching for the highest absorbency by default so that you can go longer between changes is precisely the habit the FDA guidance is written against.
How do you use a tampon correctly, step by step?
- Wash your hands. Soap and water before you open anything, for the reason the FDA gives above.
- Check the wrapper and the string. Use a tampon that is still sealed and undamaged, and give the string a gentle tug to confirm it is firmly attached.
- Get comfortable. Sitting on the toilet or standing with one foot raised relaxes the pelvic muscles. Tension is the main reason insertion feels harder than it should.
- Insert at an angle. The vagina runs backwards and upwards rather than straight up, so aim towards the small of your back. A tampon you can feel once it is in place is usually one that has not gone far enough in.
- Leave the string outside. Check it is hanging free before you get dressed, so removal is straightforward later.
- Set a reminder. Four to eight hours, and never more than eight. If your night runs longer than that, use a pad instead of stretching the tampon to cover it.
- Remove, replace, and wash your hands again. Pull the string slowly and steadily at the same angle you inserted it, then wrap the used tampon and put it in the bin rather than the toilet.
What is toxic shock syndrome, and when is it an emergency?
Toxic shock syndrome (TSS) is a rare but fast moving illness caused by toxins from certain bacteria, most often Staphylococcus aureus. It is the specific reason the wear time and absorbency rules exist. A 2024 review in the journal Antibiotics explains the mechanism: "The use of tampons creates a physicochemical environment favorable to S. aureus' growth and production of TSST-1."
If any of the following appear while you are using a tampon, remove the tampon and seek emergency medical care immediately, and tell the clinician you have been using one. TSS can progress within hours, so this is not a wait and see situation.
- A sudden high fever. The FDA describes it as "usually 102°F or more".
- Vomiting or diarrhoea.
- A rash that looks like sunburn.
- Dizziness, fainting, or feeling faint on standing.
- Severe muscle aches. Severe myalgia is one of the recognised criteria reproduced in the Antibiotics review.
- Confusion or disorientation. The same criteria include "alterations in consciousness without focal neurological signs".
Now the reassuring half, because accuracy matters in both directions. TSS is rare, and it is much rarer than it was during the outbreak that made it famous. CDC surveillance published in Emerging Infectious Diseases found that incidence "decreased from 6 to 12 per 100,000 among women 12 to 49 years of age in 1980 to 1 per 100,000 among women 15 to 44 years of age in 1986". The authors attribute that fall partly to reduced tampon absorbency following the FDA labelling requirements, and partly to better public awareness. In other words, the rules above are a large part of why the risk is now small, which is a good argument for keeping to them rather than for relaxing about them.
How do pads, cups and period underwear compare?
No product is best in general, and using more than one across a period is normal. Pads sit outside the body and involve no insertion, which is why they are a common overnight choice and a common starting point for a first period. Menstrual cups collect flow rather than absorbing it and are reusable, emptied within whatever limit the manufacturer states. Period underwear has absorbent layers built into washable fabric and is often used as a backup layer alongside something else on heavier days.
Each has its own wear time and cleaning instructions, and the sensible rule is to follow the ones that came with the product rather than transferring the tampon numbers across. For the wider picture, including how much flow is actually normal and when heavy bleeding is worth an appointment, see our complete guide to the menstrual cycle. If heavy periods are leaving you persistently exhausted, the guide to when tiredness needs a doctor covers where that line sits.
