Clinically reviewed by Dr. Pipat Finn, M.D., Senior Doctor, Doctor Pattaya. Last reviewed: August 2026
Untreated chlamydia can cause permanent damage to your reproductive system, including fallopian tube scarring, chronic pelvic pain, and in some cases, infertility. In men, it can lead to painful testicular infection and reduced sperm quality. The infection itself is curable with antibiotics. The damage it causes while untreated is not always reversible. Get tested sooner rather than later.
You had unprotected sex a few weeks ago in Pattaya, felt fine, and pushed it to the back of your mind. That is exactly how chlamydia works. Most people who have it feel nothing at all. No discharge, no pain, no sign that anything is wrong.
The problem is not how it feels right now. It is what it quietly does over weeks and months when nobody is treating it. This article covers what actually happens when chlamydia goes untreated, which complications can be fixed and which cannot, and what to do if you are in Pattaya and need to sort this out quickly and privately.
We see this more often than most people realise at Doctor Pattaya. The good news is that the infection itself is straightforward to treat. The damage it causes while waiting is the part worth understanding.
Why Chlamydia Stays Hidden for So Long
Most people who have chlamydia carry it without knowing. That is not unusual. It is the norm.
This is why testing matters more than waiting for symptoms. If you are relying on pain or discharge to tell you something is wrong, you will often miss it entirely. The infection does not announce itself. It just keeps going.
How Quickly Can Untreated Chlamydia Complications Develop?
This is the question most people want answered, and most health sites avoid it. Here is a practical picture.
Within a few weeks of untreated infection, the bacteria can spread upward from the cervix or urethra into surrounding tissues. In women, this is the start of pelvic inflammatory disease, or PID. In men, it can begin tracking into the epididymis, the small tube that carries sperm from the testicle.
After a few months without treatment, inflammation in these areas starts leaving scar tissue. Scar tissue does not go away with antibiotics. By the time an infection has gone untreated for a year or more, fertility damage in women is a real and documented risk.
Untreated Chlamydia Complications in Women
PID is the most serious complication for women. It causes inflammation in the uterus, fallopian tubes, and sometimes the ovaries. Many women with PID have mild symptoms or none at all. They often find out during a fertility workup years later.
When PID is severe or recurrent, it scars the fallopian tubes. Scarred tubes raise the risk of ectopic pregnancy, where a fertilised egg gets stuck in the tube instead of reaching the uterus. An ectopic pregnancy is a medical emergency. It can also cause chronic pelvic pain that continues long after the infection is cleared.
One complication that rarely gets mentioned is Fitz-Hugh-Curtis syndrome. This is when chlamydia-related inflammation reaches the liver capsule and causes sharp pain under the right ribs. It is often mistaken for a gallbladder problem. Some patients go through multiple investigations before anyone thinks to test for chlamydia.
Untreated Chlamydia Complications in Men
The idea that chlamydia is only a women’s issue is wrong. Men face real complications too. They just get talked about less.
The most common is epididymitis, inflammation of the epididymis, which causes scrotal pain and swelling. Left untreated, this can progress to epididymo-orchitis, where the testicle itself becomes inflamed. In severe cases, abscess formation is possible, and a small number of patients develop sepsis. These cases are uncommon but not rare in a clinic that sees undiagnosed infections regularly.
There is also evidence linking chronic chlamydia infection to reduced sperm quality. Male infertility from chlamydia alone is not common, but it is recognised clinically. The takeaway for men is the same: treat early, before complications develop.
Risks During Pregnancy and to Newborns
If chlamydia goes untreated during pregnancy, there is a real risk of passing the infection to the baby during a vaginal birth. Exposed newborns can develop a serious eye infection or pneumonia. Both are treatable, but both are entirely preventable with a simple screen and a course of antibiotics.
Untreated chlamydia in pregnancy is also linked to preterm labour and early rupture of membranes. Safe antibiotic treatment during pregnancy exists. There is no reason to delay testing if you are pregnant or trying to conceive.
Complications Beyond the Genitals
Chlamydia does not only infect the genitals. Rectal chlamydia, throat chlamydia, and eye chlamydia all occur, and all can go undetected if you only test one site.
Rectal chlamydia can cause inflammation of the rectum with or without symptoms. Eye chlamydia can cause a persistent, scarring infection if untreated. These will not show up on a standard urine or genital swab test unless you ask for those sites to be included. If your exposure involved oral or anal contact, mention it when you come in so we test accordingly.
The HIV Connection
Untreated chlamydia raises your risk of acquiring or transmitting HIV. The inflammation caused by chlamydia makes it easier for HIV to cross the body’s natural barriers. An infected person becomes more vulnerable to HIV entry, and more infectious to others if they are already HIV positive.
This is relevant in Pattaya, where HIV and chlamydia risk often overlap. If you are getting an STI test, a full panel including HIV makes sense. Doctor Pattaya offers confidential STI screening with same-day results.
What Can Be Fixed and What Cannot
Antibiotics cure the chlamydia infection. That part is clear-cut. What they cannot do is reverse scarring that has already formed.
Fallopian tube scarring remains after treatment. Chronic pelvic pain from repeated PID episodes does not always resolve when the infection clears. Tubal damage linked to ectopic pregnancy risk stays even after the bacteria are gone. Reactive arthritis, a joint condition triggered by chlamydia, can persist for months. These are not reasons to despair. They are reasons to treat early, before these changes develop.
Getting Tested and Treated in Pattaya
You do not need to register with a local GP or book days ahead. Doctor Pattaya is open around the clock, including weekends, and sees walk-in patients for confidential STI testing and treatment.
We use NAAT testing, which checks your urine or swab sample for the bacteria’s genetic material. It is the most accurate test available. Results are typically ready the same day, and treatment can start immediately when a positive result is confirmed.
A follow-up test after treatment is recommended to confirm the infection has cleared. Our team will walk you through that. Partner notification matters too. If you test positive, anyone you have had sex with recently should also be tested. You do not have to handle that conversation alone. For more on what the process looks like, visit our page on chlamydia treatment in Pattaya.
If you have had unprotected sex in Pattaya and want to get tested for chlamydia or any other STI, Doctor Pattaya is open 24 hours, 7 days a week in South Pattaya. We offer confidential NAAT testing, same-day results, and same-day treatment where needed. No appointment necessary. We also provide STI testing during hotel visits across Pattaya, Jomtien, and Naklua if you prefer not to come to the clinic. Speak to our team today.
FAQ
Dr. Pipat Finn is the senior doctor at Doctor Pattaya Takecare Clinic, a 24/7 walk-in medical practice on South Pattaya Road, Chonburi, Thailand. They provide primary care, travel medicine, sexual health, vaccination, minor surgery, IV therapy, and emergency outpatient services for tourists, expatriates, and Pattaya residents. Languages: English and Thai. WhatsApp consultations: +66 95 073 5550. Call: +66 81 668 5557.
