Chlamydia and Infertility

The Main Cause Of Infertility Worldwide
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Key takeaways

  • Chlamydia can result in infertility because it can cause damage to both male and female reproductive systems

  • If untreated, chlamydia infections can spread to the womb and fallopian tubes and can lead to pelvic inflammatory disease

  • Chlamydia can cause more 'ectopic pregnancies' where a fertilised egg starts growing somewhere other than the womb, where it's supposed to

  • Once you've had one ectopic pregnancy your chance to have another one increases

Contents of this article

Chlamydia is one of the main causes of infertility in the UK and around the world. Because the disease is frequently asymptomatic (i.e. no symptoms for the majority of patients), people often don't realise they've got it. Chlamydia often goes undetected and can spread to the body causing damage to the reproductive system in both men and women.

How does chlamydia cause infertility?

Infertility can be defined as the inability to get pregnant despite frequent unprotected sex over the course of one year. In western countries like the UK, about 15% of couples are infertile. Men are responsible for the couple’s infertility in half of these cases.

Infertility can be caused by a combination of factors which prevent a pregnancy from happening. This is usually the result of genetic factors (e.g. poor DNA quality in sperm) and environmental factors (e.g. stress, smoking).

The rise of obesity in rich countries has contributed to the rise in infertility rates, because women who are obese tend not to ovulate as efficiently as those who are not overweight.

Obesity, STI's & Infertility

Obesity and sexually transmitted diseases (STI's) rank among the most important factors causing infertility.

Over the last decade alone, the infection rate of chlamydia has doubled in the UK. Since young teenagers often don't know about the risk of sexual infections, early infections with chlamydia are very common.

Due to a lack of education with regards to STI's and contraception, young women tend to get tested too late (if at all), which results in greater potential for damage to their fallopian tubes.

As for men, it has been widely shown that sperm quality and quantity has waned over the past three decades in the West. Many factors account for this change, such as smoking, alcohol consumption and stressful lifestyles.

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Chlamydia and Female Fertility

If left untreated, chlamydia can spread and infect other parts of the female reproductive system, in particular the uterus and fallopian tubes, which can result in pelvic inflammatory disease (PID). With one in five women with chlamydia developing PID, chlamydia is the most common cause of infertility in women.

PID sometimes develops without causing symptoms and just like chlamydia, it is often diagnosed too late. Over time, the disease causes blocking or scarring to the fallopian tubes, which leads to infertility as well as miscarriage, premature birth and stillbirth.

In other cases, PID can lead to an ectopic pregnancy, which represents a serious health risk for the mother.

Ectopic Pregnancies Due to Chlamydia

When a woman gets pregnant, the egg is fertilised in the fallopian tubes before it moves to the womb (where it implants).

An ectopic pregnancy occurs, when the egg implants outside the womb, for example in one of the fallopian tubes (usually because the tubes are blocked). This happens when PID, which is often caused by chlamydia, has caused scarring to the fallopian tubes and blocked them.

Recent studies have shown, that chlamydia damages the fallopian tubes, inflicting a series of small scars. This process does not necessarily cause any symptoms and it often goes unnoticed.

How Common Is Ectopic Pregnancy

A little over 1% of all pregnancies in the UK are ectopic. The great majority of ectopic pregnancies result in miscarriage.

However, if the egg does implant in a fallopian tube, the woman needs to be treated or undergo surgery to remove the egg. Ectopic pregnancies are very dangerous and they can lead to internal bleeding.

Symptoms of Ectopic Pregnancy

The symptoms of ectopic pregnancy are relatively broad and could be related to other diseases. However, typical symptoms are:

  • late period
  • vaginal bleeding (either normal period, or vaginal discharge, sometimes brown)
  • light-headedness
  • pelvic pain
  • positive pregnancy test

If you are pregnant and experience a continuing palpitation or pounding near your pelvic area, or if you feel a sudden pain, you should contact your GP just to make sure that everything is fine.

Long-Term Consequences

Women who have already had an ectopic pregnancy are likely to develop another one. Statistics show, that 1 in 5 are likely to develop a second ectopic pregnancy, and about 1 in 3 will not manage to become pregnant again. About half of all women diagnosed with an ectopic pregnancy have babies later on.

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