Gonorrhea spreads through vaginal, anal, or oral sex with someone who has the infection. It can also pass from a pregnant person to their baby during childbirth. Those are the only meaningful routes of transmission. The bacteria that cause gonorrhea are fragile and die quickly outside the human body, so you cannot get it from toilet seats, swimming pools, or casual contact like hugging or sharing food.
Sexual Contact Is the Primary Route
Gonorrhea is caused by bacteria that infect the mucous membranes of the genitals, rectum, and throat. Any unprotected sexual contact involving these areas can transmit the infection. Vaginal and anal intercourse carry the highest risk, but oral sex can transmit the bacteria in both directions, from genitals to throat and from throat to genitals.
The per-encounter transmission risk is not equal in both directions. Early studies estimated that a woman with a genital infection transmits the bacteria to a male partner’s urethra about 22% of the time per act of unprotected vaginal sex. Transmission from an infected man to a woman is considerably higher, around 75% per encounter. These numbers reflect single unprotected exposures, so the cumulative risk rises quickly with repeated contact.
Among men who have sex with men, three sites are commonly infected: the throat, rectum, and urethra. Research suggests that urethral infections are largely acquired from unprotected anal sex, with roughly one-third of cases acquired from receiving oral sex. Kissing may also play a role in spreading throat infections, though this is still being studied.
Why Asymptomatic Carriers Spread It So Easily
One of the biggest reasons gonorrhea spreads so effectively is that most people who have it don’t know. Approximately 90% of women with a genital gonorrhea infection have no noticeable symptoms. The asymptomatic rate in men is also high, estimated between 56% and 87% depending on the study.
Infections of the throat and rectum are even more likely to be silent. Nearly all urethral infections in men produce symptoms like discharge or painful urination (about 96%), but most throat and rectal infections cause nothing obvious. People with these hidden infections can carry and transmit the bacteria for weeks or months without ever seeking testing or treatment, which keeps the infection circulating.
Where on the Body It Takes Hold
The bacteria target specific types of tissue. In the genitals, they attach to the lining of the urethra in men and the cervix in women. The bacteria use hair-like structures on their surface to latch onto cells, then essentially trick the cell into pulling them inside. Once inside the tissue, they trigger inflammation, which is what causes the burning, discharge, and swelling that some people experience.
In women, if left untreated, the infection can move upward from the cervix into the uterus and fallopian tubes. The bacteria preferentially attach to certain cell types in these tissues, which can lead to pelvic inflammatory disease, chronic pain, and fertility problems. In the throat, the bacteria colonize the tissue at the back of the mouth and pharynx. In the rectum, they infect the lining of the anal canal.
Incubation Period and When Symptoms Appear
When symptoms do develop, they typically show up 1 to 14 days after exposure. For men with urethral infections, the most common signs are a yellow or greenish discharge from the penis and a burning sensation during urination. Women may notice increased vaginal discharge, bleeding between periods, or pain during urination, though again, the vast majority of women won’t notice anything at all.
Rectal infections, when symptomatic, can cause discharge, itching, soreness, or pain during bowel movements. Throat infections rarely produce symptoms but occasionally cause a persistent sore throat.
Transmission During Childbirth
A pregnant person with an untreated gonorrhea infection can pass the bacteria to their baby as the infant moves through the birth canal. The most serious consequence is an eye infection called ophthalmia neonatorum, which can perforate the eye and cause permanent blindness if untreated. Newborns can also develop joint infections, meningitis, or infections at the site of any scalp electrode used during fetal monitoring. This is why prenatal screening for gonorrhea is standard practice.
You Cannot Get It From Surfaces
Gonorrhea bacteria can technically survive on a surface like a towel or glass slide for up to 24 hours at room temperature under laboratory conditions. In practice, however, the bacteria need warm, moist mucous membranes to establish an infection. The amount of bacteria that would transfer from a dry surface to your body is far too small to cause infection. There are no documented cases of gonorrhea transmission through toilet seats, towels, doorknobs, or shared bathing.
How Condoms Reduce Risk
Consistent condom use during vaginal and anal sex provides significant protection. Male condoms offer more than 90% protection against gonorrhea when used correctly every time. Observational studies have found a 49% to 75% reduction in gonorrhea risk among people who use condoms regularly, a lower figure that reflects real-world inconsistency in how people actually use them.
Condoms are less effective at preventing throat and rectal infections acquired through oral sex, simply because people rarely use barrier protection for oral contact. Dental dams and condoms during oral sex do reduce risk but are used far less consistently.
Reinfection After Treatment
Getting treated for gonorrhea does not make you immune. You can be reinfected immediately after finishing treatment if you have sex with an untreated partner. In fact, the CDC notes that a high rate of repeat gonorrhea cases are reinfections rather than treatment failures, usually because a sex partner wasn’t treated or because a new partner was already carrying the infection.
After treatment, you should avoid all sexual contact for at least seven days, and your partners need to complete their own treatment during that window. Both partners should wait until any lingering symptoms have fully resolved before resuming unprotected contact.