Diaphragm and Cap
Remember: the Diaphragm does NOT protect against sexually transmitted infections.
The Diaphragm does NOT protect against sexually transmitted infections. Only condoms protect against sexually transmitted infections.
The Diaphragm is a flexible rubber or silicone cap that fits inside the vagina and covers the opening to the womb (the cervix).
A doctor or nurse fits a diaphragm for you to check the size and to teach you how to use it properly. It should be used with a spermicide that kills sperm. Spermicides can be creams, foams or jellies.
Advantages of the Diaphragm:
- The diaphragm is 92-96% effective if you use it correctly.
- The diaphragm doesn’t effect how regular your periods are.
- It may protect against cancer of the cervix.
- You only use it during sex and can put it in whenever you want before sex.
However:
- It doesn’t protect against sexually transmitted infections.
- You have to keep the diaphragm in for six hours after sex and use more spermicide if you have sex again during that time.
- Some people get cystitis (an inflammation of the bladder) after using the diaphragm.
- It can be difficult to fit in the vagina properly.
- Spermicide can cause irritation or allergy for some people.
- The diaphragm fitting should be checked by a doctor or nurse every 12 months or if you put on or lose more that half a stone, have a baby,a miscarriage or an abortion.
- Thrush pessaries (creams used to treat thrush) can damage diaphragms and caps.
- Find out how to insert a diaphragm or cap here.




