Several sexually transmitted infections can cause itching around or inside the anus, including herpes, HPV (genital warts), gonorrhea, chlamydia, and syphilis. The tricky part is that many of these infections cause little or no symptoms at all, so itching may be your only early sign that something needs attention.
Anal itching on its own isn’t always an STI. But if you’ve had anal sex or intimate skin-to-skin contact and the itching is persistent, new, or accompanied by discharge, sores, or bleeding, an STI is a real possibility worth testing for.
Herpes (HSV)
Anal herpes is one of the most recognizable causes of STI-related anal itching. The itching typically arrives before you can see anything wrong. Up to 48 hours before visible sores develop, you may notice itching or tingling in the skin around your anus, sometimes along with a fever, headache, or swollen lymph nodes. This “prodrome” phase is a hallmark of herpes outbreaks and often catches people off guard because there’s nothing visible yet.
Once the sores appear, they look like small blisters or open ulcers around the anus. They can be painful, and the area may burn during bowel movements. Herpes is caused by HSV-1 or HSV-2 and spreads through direct skin-to-skin contact. Outbreaks tend to recur, and many people learn to recognize that initial itch as a warning sign of an incoming flare. Antiviral medication can shorten outbreaks and reduce their frequency, but the virus stays in the body long-term.
HPV and Anal Warts
Human papillomavirus (HPV) can cause warts in and around the anus. These anogenital warts are usually painless, but depending on their size and exact location, they can become itchy. Small warts may go unnoticed for weeks or months. Larger clusters, sometimes described as cauliflower-like growths, are more likely to cause irritation because they trap moisture and rub against surrounding skin.
Many people with anal HPV have no warts at all, since the virus often clears on its own without ever producing visible symptoms. When warts do appear and cause itching, treatment options include topical medications, freezing, or minor procedures to remove them. HPV spreads through skin-to-skin contact during vaginal, anal, or oral sex, and condoms reduce but don’t eliminate the risk since the virus can live on skin not covered by a condom.
Gonorrhea and Chlamydia
Both gonorrhea and chlamydia can infect the rectum, a condition called proctitis (inflammation of the rectal lining). This inflammation is a common cause of anal discomfort, including itching, in people who have receptive anal sex. The irritation comes from the infection itself and from any discharge it produces, which can irritate the sensitive skin around the anus.
Here’s the challenge: rectal chlamydia and gonorrhea often cause no symptoms at all. Chlamydia in particular is known for being silent. When symptoms do show up, they can include rectal pain, discharge, and bleeding, but sometimes itching is the only thing you notice. Because these infections frequently fly under the radar, routine screening matters if you’re sexually active and having anal sex. Both infections are bacterial and curable with antibiotics, typically clearing within a week or two of treatment.
Syphilis
Syphilis can produce a painless sore called a chancre at the site of infection, including the anus. This sore may itch mildly, but it’s more notable for being firm, round, and easy to miss if it’s inside the anal canal where you can’t see it. In its secondary stage, syphilis can cause a rash and flat, moist growths called condylomata lata around the anus, which are more likely to itch. Syphilis is also curable with antibiotics, but it progresses through stages if untreated, making early detection important.
Pubic Lice and Scabies
Though not infections of the rectum itself, pubic lice (crabs) and scabies are sexually transmitted parasites that can cause intense itching in the anal and genital area. Scabies mites burrow into the skin and trigger an allergic reaction that produces relentless itching, often worse at night. Pubic lice cause itching from their bites. Both are treatable with topical medications and are spread through close physical contact or, in some cases, shared bedding or clothing.
Non-STI Causes Worth Knowing
Not every case of anal itching traces back to an STI. Pinworms are a common cause, especially in children and their household contacts. Female pinworms lay eggs on the skin around the anus at night, which causes itching that’s characteristically worse during sleeping hours. A simple tape test at your doctor’s office can confirm or rule them out.
Other frequent culprits include hemorrhoids, moisture from sweating, skin irritation from soaps or wipes, fungal infections, and dietary triggers like coffee or spicy food. Contact dermatitis from scented toilet paper or hygiene products is surprisingly common. If you don’t have risk factors for an STI (no recent sexual contact, no new partners), these everyday causes are statistically more likely.
How Testing Works
If you suspect an STI is behind your symptoms, testing is straightforward. Rectal swabs can detect gonorrhea and chlamydia, and results typically come back within a few days. Herpes can be tested through a swab of an active sore or through a blood test for antibodies. HPV is usually diagnosed visually when warts are present. Syphilis is detected through a blood test.
The most important thing to know is that you can have a rectal STI without having had receptive anal sex. Some infections can spread to the anal area from nearby genital infections, and skin-to-skin contact during other sexual activities can transmit HPV, herpes, and syphilis. If itching persists for more than a week or two, or if you notice discharge, sores, bleeding, or pain, getting tested gives you a clear answer and a path to treatment. Most of these infections are either curable or highly manageable once identified.