What can help with painful sex after pelvic radiation?

Several things help, and most of them are simple. The National Cancer Institute lists five: vaginal gels or creams for a dry, itchy, or burning feeling; vaginal lubricants or moisturizers; vaginal estrogen cream, which "may be appropriate for some types of cancer"; a dilator to help prevent or reverse scarring; and exercises for the pelvic muscles. NCI also says that treating pain, fatigue, and low mood makes a real difference, because those problems affect sex too.

What pelvic radiation does to the tissue

Radiation aimed at the bladder, cervix, colon, ovaries, rectum, uterus, or vagina can lower estrogen levels. Low estrogen dries the vaginal lining.

NCI names three separate changes. Vaginal stenosis means the vagina becomes less elastic, narrower, and shorter. Vaginal atrophy means weak vaginal muscles and a thin vaginal wall. On top of both, the lining can itch, burn, and swell.

MedlinePlus describes the same chain from the other end. When estrogen levels drop, the tissues of the vagina gradually shrink and become thinner, which causes dryness and inflammation. It lists radiation to the pelvic area and chemotherapy among the causes.

So this is a tissue problem with a physical cause. It is not a problem of wanting sex less or of not trying hard enough.

Lubricant, moisturizer, and estrogen are three different products

These words often get used as if they meant one thing. They do not.

A lubricant is used at the time of sex. MedlinePlus recommends a water-soluble one, and warns that petroleum jelly, mineral oil, and other oils can damage latex condoms and diaphragms.

A moisturizer is used on a schedule rather than only during sex. MedlinePlus says lubricants and vaginal moisturizing creams often moisten the area for several hours, up to a day. Both are sold without a prescription.

Vaginal estrogen is a prescription. It comes as a cream, tablet, suppository, or ring, all placed directly in the vagina, and only a little reaches the bloodstream. NCI's careful wording — appropriate for some types of cancer — is the point. For hormone receptor positive breast cancer this is an oncologist's call, not a shelf purchase.

The dilator and the pelvic floor

A dilator is a smooth tube used to hold the vagina open while tissue heals. NCI lists it as a way to prevent or reverse scarring when radiation therapy or graft-versus-host disease has affected the vagina.

Pelvic floor exercises sit next to it. NCI says they can lower pain, improve bladder retention, improve bowel function, and raise blood flow to the area.

NCI publishes no schedule for either one. There is no stated number of minutes and no stated number of days a week on its page. That plan comes from the radiation oncology team or a pelvic floor physical therapist, and both are worth asking for by name. Our guide to sexual health for women with cancer covers the wider set of changes, and the piece on sexual health and cancer covers talking about it with a partner.

When to call instead of waiting

MedlinePlus gives a plain trigger: contact a provider for vaginal soreness, burning, itching, or painful intercourse that does not clear up with a water-soluble lubricant.

Call sooner for bleeding after sex, a new discharge, or a fever of 100.4 °F (38 °C) or higher. Dry tissue cracks, and cracks let infection in. NCI also notes there are stretches of treatment when the risk of infection or bleeding is high enough that abstaining is advised, so that timing is worth confirming with the team.

One more thing worth knowing: NCI's page was last reviewed on December 29, 2022.

Sources

• https://www.cancer.gov/about-cancer/treatment/side-effects/sexuality-women
• https://medlineplus.gov/ency/article/000892.htm
• https://medlineplus.gov/ency/patientinstructions/000913.htm