“The clap” is a slang term for gonorrhea, one of the most common sexually transmitted infections worldwide. It’s caused by a bacterium that infects the mucous membranes of the genitals, rectum, or throat, and it spreads through vaginal, oral, or anal sex. Symptoms typically appear 1 to 14 days after contact with an infected person, though many people, especially women, never develop noticeable symptoms at all.
Why Is It Called “The Clap”?
The origin isn’t entirely settled. The most widely cited theory traces the nickname to an old French word, “clapoir,” meaning a sexual sore or swelling. Another theory suggests it referred to the old (and painful) practice of clapping the penis between both hands to force out infected discharge. Whatever the origin, the term has stuck around for centuries and remains one of the most recognized slang terms for any STI.
Symptoms in Men
Men are more likely than women to notice something is wrong. The most common signs include a burning sensation when urinating and a white, yellow, or green discharge from the penis. Some men also develop painful or swollen testicles, though that’s less common. These symptoms can range from mild to hard to ignore, and they usually show up within the first two weeks after exposure.
Symptoms in Women
Gonorrhea is trickier to catch in women because the symptoms are often mild or completely absent. When symptoms do appear, they can include painful urination, increased vaginal discharge, and bleeding between periods. Because these signs overlap with common conditions like urinary tract infections or yeast infections, many women don’t realize they have gonorrhea until complications develop or a partner is diagnosed. This is one of the main reasons routine screening matters for sexually active women under 25 and anyone with new or multiple partners.
Throat and Rectal Infections
Gonorrhea doesn’t just affect the genitals. It can infect the throat through oral sex and the rectum through anal sex. Throat infections are particularly sneaky because they rarely cause symptoms. When they do, the signs are easy to mistake for a regular sore throat. Rectal infections may cause discharge, itching, soreness, or painful bowel movements, but they can also be silent.
These infections matter because they can spread to partners even without symptoms, and standard urine tests won’t detect them. If you’ve had oral or anal sex, you need swabs from those specific sites to get an accurate result.
How It’s Diagnosed
The gold standard for gonorrhea testing is a type of DNA detection test that picks up the bacterium’s genetic material. These tests are more than 95% sensitive and over 99% specific, meaning false results are rare. For men, a urine sample works well and performs as reliably as a urethral swab. For women, a vaginal swab is the preferred method since urine testing can miss up to 10% of infections compared to swab samples.
For symptomatic men, a quick microscope exam of urethral discharge can sometimes confirm the diagnosis on the spot. But this method isn’t reliable enough to rule the infection out in men without symptoms, and it’s not recommended as the sole test for women.
Treatment
Gonorrhea is curable, but treatment has gotten more complicated over the years. The bacterium has developed resistance to nearly every antibiotic ever used against it, including entire drug classes that were once the go-to options. Fluoroquinolones, for example, were dropped from the recommended list in 2007 after resistance rates climbed to nearly 14% of samples tested.
Today, treatment comes down to a single injection of a last-remaining effective antibiotic. That’s it: one shot, one visit. If a chlamydia co-infection hasn’t been ruled out (and the two infections frequently travel together), you’ll also be given a week-long course of oral antibiotics to cover that.
You should be retested three months after treatment to check for reinfection, which is common. Avoiding sex for at least seven days after treatment helps prevent passing the infection back to a partner.
What Happens If It Goes Untreated
Left alone, gonorrhea doesn’t just linger. It can climb deeper into the reproductive tract and cause serious problems. In women, the infection can spread to the uterus and fallopian tubes, triggering pelvic inflammatory disease (PID). Even mild or symptom-free PID can scar the fallopian tubes enough to cause infertility or increase the risk of ectopic pregnancy, where a fertilized egg implants outside the uterus. About half of PID cases involve gonorrhea or a closely related bacterium.
In men, untreated gonorrhea can lead to epididymitis, a painful infection of the tube that carries sperm from the testicle. In rare cases, this can also affect fertility. In both men and women, the bacteria can occasionally enter the bloodstream and cause joint infections, skin lesions, or other systemic illness.
Why Antibiotic Resistance Matters
Gonorrhea’s ability to evolve past antibiotics is a genuine public health concern. The CDC has described it plainly: it’s only a matter of time before the bacterium develops resistance to the last effective treatment. This is why completing prescribed treatment exactly as directed is important, and why researchers are actively working on new options. For now, the single remaining recommended drug still works, but the margin is narrow. If you’re treated and symptoms persist, returning for follow-up testing is critical so that any resistant infection can be identified and managed.