LGV (Lymphogranuloma Venereum): Symptoms and Treatment

You had a full night out in Patong. Days to weeks later something feels wrong. Maybe it is a painful lump in your groin. Maybe it is rectal cramping and discharge that started after anal sex. You searched chlamydia online, got tested somewhere, and the result came back negative. That result does not rule out LGV. Standard chlamydia tests detect the bacteria but cannot tell you which subtype, and LGV comes from specific subtypes that need their own test.

LGV cases are likely underdiagnosed across the region. The MSM community in Patong, the volume of visitors with multiple sexual partners during short trips, and the regional endemicity across Southeast Asia all create the right conditions for this infection to go undiagnosed. The symptoms are easy to confuse with something else. The testing gap is real. And the treatment, while straightforward, needs three full weeks to work.

What Makes LGV Different from Standard Chlamydia

LGV stands for lymphogranuloma venereum. It is caused by Chlamydia trachomatis, the same bacteria behind standard chlamydia, but specifically the L1, L2, and L3 serovars. Those subtypes behave differently from the rest. Instead of staying in the genital tract, they invade the lymphatic system, the network of small channels and nodes running through your groin and pelvis.

That lymphatic invasion is what makes LGV distinct. It causes swelling, scarring, and sometimes serious tissue damage if it goes untreated. Left long enough, it can cause permanent changes to lymph node tissue and, in the case of rectal infection, significant structural damage to the bowel. This is not a skin infection or a simple discharge.

LGV STD Symptoms to Know

The infection tends to develop in stages, though not everyone notices the first one. A small, painless ulcer or blister appears at the point of infection, usually on the genitals, rectum, or mouth. It heals on its own within days to a couple of weeks. Most people miss it or dismiss it.

The second stage is harder to ignore. The lymph nodes in the groin swell, often on one side, and become painful. These swollen nodes are called buboes. They can grow large, become tender to the touch, and occasionally break open and drain. Fever and fatigue are common at this point.

Rectal LGV looks different and gets misdiagnosed more often. The main symptoms are rectal pain, mucous discharge, tenesmus (a constant urge to pass stool that does not resolve), and sometimes bleeding. This can look almost identical to inflammatory bowel disease or proctitis from another cause. Some patients spend months getting the wrong treatment before anyone tests for LGV.

If the infection is not treated, scarring and fibrosis can develop. This can cause chronic lymph node swelling, fistulas, and in some cases permanent rectal damage. This stage is entirely preventable. It only happens when the first two are missed or ignored.

Testing for LGV in Phuket

A standard NAAT, the nucleic acid amplification test used for routine chlamydia screening, can confirm Chlamydia trachomatis is present but cannot differentiate LGV serovars from other strains. A positive standard chlamydia result from a rectal swab in a patient with proctitis symptoms should raise suspicion for LGV. An LGV-specific PCR, sometimes called reflex LGV PCR, is needed to confirm it.

What sample is taken depends on where the symptoms are. Genital ulcers, lymph node fluid, and rectal swabs are all used depending on presentation. If you have rectal symptoms after anal sex, a rectal swab chlamydia NAAT is the starting point. An LGV-specific PCR follows if that comes back positive or clinical suspicion is high.

A common question is whether a standard chlamydia test detects LGV. It does not. This matters because a negative pharmacy test or a standard sexual health screen does not rule LGV out. At Takecare Clinic Phuket, you can walk in and ask for the right test without a referral or prior GP letter. The key is making sure the testing includes what is clinically indicated, not just what a standard panel covers. You can read more about what a chlamydia test can and cannot tell you on our STD testing page.

Treatment: Why the Full 21 Days Matters

LGV is curable. That is the most important thing. The standard treatment is doxycycline 100mg twice daily for 21 days. This is longer than treatment for standard chlamydia, and the full 21 days is not optional. Stopping early increases the risk of treatment failure and scarring. Doxycycline should not be taken during pregnancy. If you are pregnant or think you might be, tell the doctor before any prescription is written, as a different regimen is needed.

If you are a tourist mid-trip and you think you have LGV, do not wait until you are home. A walk-in consultation in Patong can get you assessed, tested, and started on a prescription the same day. The 21-day course can be dispensed in full even if you are leaving Phuket before it is complete.

Partners need to be notified. Current guidelines recommend tracing and notifying sexual partners from the 60 days before symptoms started, so they can be tested and treated. That is not a comfortable conversation, but it is the one that stops this spreading. If you are concerned about confidentiality in a resort setting like Phuket, partner notification support can be discussed privately at the clinic. Testing is conducted without involving your hotel, travel companions, or anyone else.

A follow-up test at around three months after completing treatment is recommended. This confirms the infection has cleared and is especially relevant if symptoms were severe or rectal damage was suspected.

What Else to Test For at the Same Time

LGV rarely comes alone. Guidelines recommend that anyone being investigated for LGV also gets tested for HIV, syphilis, hepatitis C, and gonorrhoea. This is standard practice, not a signal that something is worse than you think. These infections share transmission routes and regularly co-exist.

An HIV test in Phuket is worth doing regardless of other results. If there was a risk exposure in the last 72 hours, PEP can prevent HIV infection if started quickly enough. That window closes fast, so same-day access matters. For ongoing protection, PrEP is available at Takecare Clinic Phuket for patients who want a longer-term strategy.

If your LGV test is pending but symptoms point strongly toward rectal LGV, guidelines support starting doxycycline before the result is confirmed. This is called presumptive treatment and it is appropriate when the clinical picture is clear and delay carries real risk of progression.