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Common STIs explained: Why testing matters

by | Jun 24, 2026 | STI Testing

Sexual health is an important part of your overall well-being, yet it’s often overlooked due to stigma or embarrassment. The reality is that STIs are common, and many can be present without causing any noticeable symptoms. Regular STI testing plays a vital role in protecting both your health and that of your partners. At NorthGene™, we offer convenient, affordable at-home testing for four of the most common STIs in the UK. In this guide, we explain what these infections are, how they can affect you and why comprehensive STI testing is so important…

What are STIs?

STIs (sexually transmitted infections) are infections that are spread through sexual activity, including sex and sexual contact through skin-to-skin contact.

More than 30 types of bacteria, virus and parasites that can be transmitted through sexual contact and lead to various STIs. While some infections cause noticeable symptoms, many do not, which makes regular detection essential for early detection and treatment.

Chlamydia

Chlamydia is the most common bacterial STI in the UK. It is caused by bacteria called ‘chlamydia trachomatis’ and is typically transmitted by having unprotected vagina, anal or oral sex.

Symptoms

Many people with chlamydia often experience no symptoms at all, particularly in the early stages of infection. When symptoms do occur, they may appear between one week and several months after exposure. Common symptoms include:

  • Pain or a burning sensation when urinating
  • Usual discharge from the vagina, penis or anus
  • Pelvic pain in women
  • Testicular pain in men

Treatment

If left untreated, chlamydia can last indefinitely and lead to serious health implications for both men and women, including infertility and pelvic inflammatory disease (PID).

Fortunately, chlamydia can usually be treated effectively with antibiotics prescribed by a healthcare professional. Early diagnoses and treatment help to reduce the risk of these long-term implications and can clear the infection within 1-2 weeks.

Gonorrhoea

Gonorrhoea is the second most common bacterial STI in the UK, and is particularly prevalent in people under the age of 25. It is caused by the bacteria ‘neisseria gonorrhoeae’ or ‘gonococcus’. It is also known as “the clap” and can affect various parts of the body including:

  • the genitals,
  • throat,
  • eyes and
  • rectum.

Symptoms

Like chlamydia, gonorrhoea can sometimes be asymptomatic. When symptoms do appear, they typically show up within 1 to 14 days after exposure – though in some cases, they may not appear for weeks or even months. Symptoms may include:

  • Pain or a burning sensation when urinating
  • Usual discharge from the vagina, penis or anus
  • Pelvic pain
  • Bleeding between periods

Antibiotic resistance and ‘Super Gonorrhoea’

Some strains of gonorrhoea have developed resistance to commonly used antibiotics, sometimes referred to as “Super Gonorrhoea.”

While most gonorrhoea infections can still be successfully treated, antibiotic resistant strains are becoming an increasing public health concern. This highlights the importance of early testing, diagnosis and completing any prescribed treatment properly.

Mycoplasma (MGen)

‘Mycoplasma genitalium’ or MGen, is a bacterial STI that has become increasingly common in recent years. It frequently occurs alongside other STIs and historically has been difficult to detect. Advancements in testing, like our Enhanced kits, have demonstrated the importance of mycoplasma testing, helping to improve detection rates and highlight the importance of screening for MGen.

Current data suggests that around 1–2% of the adult population has mycoplasma genitalium, making it nearly as common as chlamydia. The infection is mostly seen in men aged 25–34 and women aged 16–19.

Symptoms

Many MGen infections cause no symptoms and can remain undetected for months or even years, which can lead to delayed diagnosis and treatment. However, when symptoms do occur, they can often be mistaken for chlamydia.

If left untreated, MGen can pose serious risks to your health and wellbeing, including:

  • infertility,
  • sexually acquired reactive arthritis,
  • pelvic inflammatory disease in women, which is an infection in the womb and fallopian tubes, and
  • men may experience a painful swelling and infection of the testicles and epididymis.

Testing regularly is one of the most effective ways to identify the infection and protect your long-term sexual health.

Learn more about MGen in our recent blog.

Trichomoniasis

Trichomoniasis or “Trich” is an STI caused by a parasite called ‘Trichomonas vaginalis’. The infection is transmitted through unprotected sexual contact – sex without a condom or by sharing sex toys.

Symptoms

70-85% of people with trichomoniasis don’t experience any symptoms, so it’s important to get tested even if you feel fine. When symptoms do arise, they typically tend to do so within 5-28 days of exposure and can include:

  • Genital irritation or itching
  • Pain when urinating
  • Unusual discharge
  • Discomfort during sex

Links to HIV

Trichomoniasis can increase the risk of contracting or transmitting HIV. This is because trich causes inflammation in the genital area, making it easier for the HIV virus to enter the body or be transmitted to a partner. Research shows that trichomoniasis can increase the likelihood of HIV acquisition by around 1.5 times.

The importance of safe sex and regular testing cannot be overstated, ensuring not only your own health, but your partners too.

Treatment

Trich is usually treated effectively with medication prescribed by a healthcare professional. Treatment usually lasts for 7 days, but it is essential to complete the full course of medication, even if symptoms improve, to ensure that the infection is fully cleared.

The importance of comprehensive testing

Many STIs cause few or no symptoms, making it impossible to know your status based on these alone. Regular testing helps to ensure your long-term health, protecting you against further issues by:

  • Detecting infections early
  • Reducing the risk of passing infections to partners
  • Providing reassurance and peace of mind

Education and awareness surrounding sexual health and STIs is equally important – and you can learn more about this in some of our helpful guides:

Confidence in your health with NorthGene™

At NorthGene™, we make STI testing simple, convenient and accessible. Our at-home test kits screen for four of the most common STIs, allowing you to take control of your sexual health from the comfort and privacy of your own home.

Once your sample arrives at our laboratory, our expert team carries out analysis to the highest standards, with results available within 1–2 working days. If you have any questions along the way, we’re here to help with discreet, professional support and guidance throughout the testing process.

Regular STI testing is an important part of protecting your long-term health and wellbeing. Whether you’re experiencing symptoms, starting a new relationship or simply want peace of mind, NorthGene™ makes it easy to know your status with confidence.

Order your STI test today or contact our friendly team to learn more.

Tagged: STI Testing

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