LGV symptoms most often show up as rectal trouble — mucoid or bloody discharge, anal pain, constipation, and a constant urge to pass stool (tenesmus) — or as tender, usually one-sided swelling of the lymph nodes in the groin. LGV is an aggressive form of chlamydia, so symptoms run more severe than ordinary chlamydia and demand a longer treatment course.
with the right treatment
testing, not symptoms, decides
| Item | Value |
|---|---|
| Curable? | yes — with the right treatment |
| Tested by | NAAT / lab |
| If you may have it | get tested — testing, not symptoms, decides |
What LGV actually is
LGV stands for lymphogranuloma venereum. It's caused by Chlamydia trachomatis, the same species behind ordinary genital chlamydia — but by specific serovars, L1, L2, or L3, that behave very differently CDC LGV guidelines. Instead of staying in the surface lining of the genitals or rectum like garden-variety chlamydia, these strains invade the lymphatic tissue and trigger deep, destructive inflammation. That's why the disease can scar tissue and swell lymph nodes rather than just causing a mild discharge.
The practical takeaway: a standard chlamydia test may flag the bacteria, but it won't always tell you which strain you have, and the LGV strains need a different, longer treatment. If you want the side-by-side, see lgv vs regular chlamydia.
LGV symptoms — and the silent reality
LGV classically moves through three stages, and most people who seek care are well past the first one because the early sign is so easy to miss.
Stage one is a small, painless sore or ulcer at the site of infection — the rectum, genitals, or mouth. Because it doesn't hurt and heals on its own, it's frequently never noticed. This is the silent reality of LGV: the body's first warning is the one most people skip right past, which lets the infection march on undetected.
Stage two is where symptoms usually drive someone to a clinic, and it looks different depending on where the infection landed.
Rectal LGV (proctocolitis)
The most common presentation today is proctocolitis — inflammation of the rectum and lower colon — from rectal infection. Symptoms include mucoid or bloody discharge from the anus, anal pain, constipation, fever, and tenesmus, that nagging feeling that you constantly need to pass stool even when there's nothing to pass. This cluster is exactly why rectal LGV gets misread as inflammatory bowel disease (IBD), like ulcerative colitis or Crohn's — the bloody discharge, urgency, and pain overlap closely. Outbreaks have been reported among men who have sex with men, frequently in people also living with HIV. A scope and biopsy that suggests IBD in a sexually active person should prompt a test for LGV before anyone starts immune-suppressing treatment.
Inguinal LGV (groin swelling and buboes)
The second classic picture is tender, usually one-sided swelling of the lymph nodes in the groin — the inguinal or femoral nodes. Left untreated, these can progress to buboes: fluctuant, pus-filled swellings that may rupture through the skin. This groin presentation is the more common picture among heterosexual patients, who tend to acquire genital rather than rectal infection. The swelling can be dramatic and painful, and it's a strong clue that this isn't ordinary chlamydia.
Stage three, if the infection is never treated, is chronic scarring — long-term inflammation that can damage the lymphatic drainage and the rectum itself. That's the stage you want to avoid entirely, and treatment in stage two prevents it.
How LGV spreads
LGV is sexually transmitted through anal, vaginal, or oral sex — the same routes as other chlamydia. Rectal infection comes from receptive anal contact, which is why proctitis dominates in the MSM outbreaks. The infection passes through direct contact with infected secretions or mucous membranes, so any unprotected sexual contact with someone carrying the L-strains can transmit it. Because the first-stage sore is painless and easy to miss, people can pass it on without knowing they're infected.
How LGV is tested
Diagnosis rests on clinical suspicion plus a Chlamydia trachomatis NAAT (nucleic acid amplification test) taken from the symptomatic site — the rectum if you have proctitis, the genitals or a node aspirate if you have groin swelling — with other causes ruled out. A positive chlamydia NAAT from the rectum in someone with proctocolitis is treated as LGV until proven otherwise; specialized strain typing to confirm L1–L3 isn't available everywhere, so clinicians often treat based on the clinical picture.
What testing is actually like: most STI samples are simple — a urine cup, a self-collected swab, or a quick exam — and results usually come back in a few days. For rectal symptoms you'll likely have a rectal swab and an exam of the area. Testing is free or low-cost at health departments, Planned Parenthood, and Title X clinics. If you've had a recent exposure and aren't sure how soon a test will be accurate, read when to test after exposure before you book.
Ready to act? You can get tested now, and if you'd rather see your options first, compare testing providers.
How LGV is treated
The recommended treatment is doxycycline 100 mg orally twice a day for 21 days — notably longer than the short course used for ordinary chlamydia, because the deeper tissue invasion takes more time to clear. Buboes may also need to be drained or aspirated if they're large and painful, but the antibiotics are the core of the cure.
- Finish the entire course even after you feel better — stopping early is the most common mistake, and with LGV the long duration is exactly the point.
- Ask whether your recent partners need treating so the infection isn't passed back and forth between you.
- Hold off on sex until you and your partners have completed treatment.
LGV vs ordinary chlamydia at a glance
| Ordinary genital chlamydia | LGV | |
|---|---|---|
| Strains | Non-L serovars | L1, L2, or L3 |
| Typical symptoms | Mild or none; discharge, burning | Proctocolitis with bloody discharge, tenesmus; or tender groin nodes / buboes |
| Severity | Surface inflammation | Deep, lymphatic, scarring inflammation |
| Treatment length | Short course | Doxycycline 100 mg twice daily for 21 days |
What happens if LGV is untreated
Untreated LGV doesn't stay quiet — it scars. Possible complications include:
- Chronic proctocolitis with rectal strictures (narrowing of the rectum from scar tissue that can make passing stool painful and difficult).
- Fistulas (abnormal tunnels that form between the rectum and nearby tissue or skin, which can leak and need surgery).
- Buboes that rupture and drain through the skin, leaving open, slow-healing wounds in the groin.
- Lymphatic damage and chronic swelling (lymphedema) of the genitals from destroyed drainage channels — a disfiguring, hard-to-reverse outcome.
- Greater vulnerability to HIV transmission, since the inflamed, broken tissue gives the virus an easier entry point.
How to prevent LGV
The same steps that prevent other STIs apply here. Condoms used every time lower the risk for sexually transmitted infections, and routine testing catches what has no symptoms — which matters a lot for LGV, given how silent the first stage is.
- Use condoms consistently for anal, vaginal, and oral sex.
- Test regularly if you're sexually active, especially if you have multiple partners — and ask specifically about rectal testing if you have receptive anal sex.
- Treat partners so the infection isn't bounced back and forth.
When to see a clinician
Get checked if you have anal pain, rectal discharge or bleeding, a constant urge to pass stool, or new tender swelling in the groin — particularly after a new sexual partner. Don't wait it out assuming it's hemorrhoids or a stomach bug, and if you've already been told you might have IBD but you're sexually active, ask whether LGV has been ruled out. A diagnosis here is common and treatable — clinics handle it daily, and it says nothing about you as a person.