A common bacterial sexually transmitted infection caused by Chlamydia trachomatis. Review possible symptoms, contributing factors, assessment, warning signs and
About Chlamydia
A common bacterial sexually transmitted infection caused by Chlamydia trachomatis
Chlamydia is one of the most common sexually transmitted infections (STIs) worldwide, caused by the bacterium Chlamydia trachomatis.
It often has no symptoms, especially in women, which is why it's sometimes called a "silent" infection. If left untreated, it can lead to serious reproductive health problems.
The good news is that chlamydia is easily cured with antibiotics when detected early through testing.
Editorial update (28 September 2026): structured medical content awaits clinical reviewer sign-off.
How assessment may be approached
Assessment may include symptom timing, fever, exposures, travel, contacts, vaccination status and medicines. Tests may identify a specific infection, but treatment decisions should match clinical urgency and local guidance.
Care can range from monitoring and fluids to prescribed treatment, infection-control measures and follow-up. Ask whether antibiotics or other medicine are actually indicated and how to prevent spread.
When to seek prompt care
Seek urgent care for stiff neck, severe headache, confusion, breathing difficulty, persistent vomiting, dehydration, rash with fever, severe weakness or rapidly worsening illness.
Symptoms
- Often no symptoms (asymptomatic)
- Abnormal vaginal or penile discharge
- Burning sensation during urination
- Pain during sexual intercourse
- Lower abdominal pain
- Testicular pain in men
- Bleeding between periods in women
Possible causes
- Unprotected vaginal, anal, or oral sex
- Sexual contact with infected partner
- Mother to baby during childbirth
- Sharing sex toys without proper cleaning
Care and treatment options
- Antibiotics (Azithromycin or Doxycycline)
- Partner notification and treatment
- Abstinence during treatment
- Follow-up testing after 3 months
- Safe sex practices
Key points
- Most common bacterial STI
- Easily cured with antibiotics
- Often has no symptoms
- Can cause infertility if untreated
- Preventable with condom use
Preparing for a consultation
- Fever readings and timing of symptoms.
- Travel, food, water, animal or contact exposures.
- Vaccination history and immune-suppressing medicines.
- Recent test results, medicines and who else may be unwell.
Questions worth asking
- Is Chlamydia the most likely explanation for these symptoms, and what alternatives should be checked?
- Which symptoms or findings would require urgent review?
- Are medicines, underlying health problems or lifestyle factors contributing?
- What tests or examinations are needed now, and what can safely wait?
- What treatment or self-care options are reasonable, and when should I be reviewed again?
- What is the expected benefit, limit, cost and follow-up plan for the suggested care?
Related conditions
Related clinicians
Related tests
Medical information limitations
This page summarizes listed condition information and cannot confirm a diagnosis or choose treatment. Do not start, stop or change prescribed treatment based only on this page.
Common questions
What is Chlamydia?
A common bacterial sexually transmitted infection caused by Chlamydia trachomatis This is general information; the name describes a possible diagnosis or clinical problem, not a personal diagnosis.
How might a clinician assess Chlamydia?
Assessment may include symptom timing, fever, exposures, travel, contacts, vaccination status and medicines. Tests may identify a specific infection, but treatment decisions should match clinical urgency and local guidance.
What care may be discussed?
Care options listed include Antibiotics (Azithromycin or Doxycycline), Partner notification and treatment, Abstinence during treatment, Follow-up testing after 3 months. Which option is appropriate depends on the confirmed cause, severity, preferences and contraindications.
When should Chlamydia be checked urgently?
Seek urgent care for stiff neck, severe headache, confusion, breathing difficulty, persistent vomiting, dehydration, rash with fever, severe weakness or rapidly worsening illness.
How should I prepare for a consultation?
Fever readings and timing of symptoms. Travel, food, water, animal or contact exposures. Vaccination history and immune-suppressing medicines. Recent test results, medicines and who else may be unwell. Bring previous reports and a current medicine list where relevant.
Can this page diagnose or treat the condition?
No. A page about Chlamydia can help you understand possible features and questions, but it cannot confirm a diagnosis or choose treatment. A qualified clinician should assess your symptoms, history and any test results.
General information only; it is not a diagnosis or a substitute for a qualified clinician’s advice.