Explosion of Sexually Transmitted Infections (STIs) in Europe in 2025 : Causes and Preventive Strategies

Since the beginning of 2025, Europe has witnessed a marked and worrying rise in sexually transmitted infections (STIs), such as syphilis, chlamydia, gonorrhea and trichomoniasis. This trend is seen in several European countries and fits into a global dynamic that public health authorities find alarming.

Far from being mild, untreated STIs can have serious consequences: infertility, pregnancy complications, increased vulnerability to HIV, or even neurological and cardiac damage in the case of syphilis. This surge underscores the importance of screening, prevention and appropriate care, both for individuals and for society.

In this context, several key questions arise:

• What are the latest STI figures in Europe? Should we really be worried in 2025?
• Why have STIs been rising so sharply in recent years?
• What concrete health risks do I face if I contract an STI?
• How can we truly protect ourselves effectively against STIs today?
• What role do doctors and healthcare workers play in fighting this silent epidemic?

STIs in 2025: A sharp rise in Europe

According to the most recent data from the World Health Organization (WHO), every day worldwide more than 1 million people aged 15 to 49 contract an STI, posing major public health challenges and causing nearly 2.5 million deaths each year.

In 2020, an estimated 374 million people aged 15 to 49 contracted one of the four curable STIs: chlamydia, gonorrhea, syphilis or trichomoniasis.

However, over the past year, new data from the United Nations health agency (WHO) show that STI cases have risen significantly in many regions. The biggest increases were recorded in Latin America and Africa, but also in Europe.

In Europe, health authorities describe this rise as alarming. According to the latest figures (reference year 2023) from the European Centre for Disease Prevention and Control (ECDC):

• Gonorrhea: about 100 000 cases in the EU/EEA in 2023 (10 723 in France), a 31 % increase over 2022 and three times the number recorded in 2014 (+300 %), with a 46 % rise among 20–24-year-olds in just one year. Men who have sex with men (MSM) account for over half of reported cases (around 60 %). Recent data also point to an increase in multidrug-resistant gonorrhea strains. The WHO is monitoring the situation and has updated its treatment recommendations to curb the spread of these resistant strains.
• Syphilis: once on the brink of disappearing in the 2000s, cases have doubled in ten years, exceeding 41 000 in 2023—a 13 % rise since 2022—with 72 % of patients being MSM. Congenital syphilis (mother-to-child transmission) has also increased dramatically.
• Chlamydia: very common among 15–24-year-olds, it continues to rise despite awareness campaigns. Over 230 000 new infections occurred in 2023 (19 122 in France), a 13 % increase over ten years, with high incidence in women aged 20–24.
• Trichomoniasis: included among the curable STIs monitored in Europe, with a notable prevalence in the general population.

Why are STIs exploding in Europe? Causes of a worrying increase

This global, and particularly European,increase in STI cases stems from a mix of health, social and behavioral factors. Key contributors include:

1- Reduced vigilance after COVID-19

After the COVID-19 pandemic, sexual health vigilance waned. Public health systems focused resources on the pandemic response, often at the expense of STI prevention. Many testing centers, such as CeGIDD clinics, hospital consultations and community clinics, either closed temporarily or operated at reduced capacity, sharply limiting access to tests. As a result, many infections went undiagnosed and untreated, fostering silent, ongoing transmission.

2- Still-limited sexual education

In several European countries, sex education remains inadequate sometimes too conservative or out of step with today’s realities. This leads to unclear information on how STIs spread and poor knowledge of effective prevention methods (condoms, PrEP, or the role of regular testing). Consequently, many young adults are ill-equipped to adopt protective behaviors.

3- Changes in sexual behavior

Sexual practices have evolved, especially among young adults and at-risk groups. Dating apps facilitate multiple and sometimes anonymous encounters. Casual or multiple partnerships often occur without consistent preventive measures. Practices such as “chemsex” (using psychoactive substances in sexual contexts) reduce risk awareness and increase vulnerability to STIs, particularly in certain party or community settings.

4- Deep inequalities in healthcare access

Some populations migrants, homeless people, sex workers or socially isolated youth face higher STI exposure but struggle to access prevention and care. Language barriers, lack of health coverage, poverty, stigma and distrust of institutions all contribute to low screening rates, delayed diagnoses and limited treatment access, creating under-detected infection hotspots that fuel ongoing transmission.

5- Emergence of antibiotic resistance: a growing threat

The rise of drug-resistant bacterial strains is a major global public health challenge, and Europe is no exception. In particular, Neisseria gonorrhoeae, the bacterium behind gonorrhea, is increasingly resistant to first-line antibiotics. This complicates treatment, prolongs infections and raises the risk of onward transmission.

An STI that’s harder to treat is also harder to control at the population level.

STIs: Medium and long-term health risks

The rise in STIs is not just an epidemiological concern; it carries significant health, social and economic consequences for individuals and European healthcare systems. Without timely treatment or with delayed diagnosis, STIs can lead to serious often preventable complications.

1- Sometimes irreversible medical complications

Untreated STIs such as chlamydia and gonorrhea frequently cause pelvic inflammatory disease, leading to chronic pain, ectopic pregnancies and, ultimately, infertility especially in young women. Other STIs (herpes, syphilis, gonorrhea) increase HIV transmission risk by weakening genital mucosa and elevating local viral loads. When contracted during pregnancy, certain STIs can pass to the child, causing miscarriage, preterm birth, low birth weight, malformations or severe newborn infections. Persistent human papillomavirus (HPV) infection is the main cause of cervical cancer, one of the deadliest cancers among women. Finally, hepatitis B led to about 1.1 million deaths worldwide in 2022, primarily from liver cirrhosis or cancer.

2- Often underestimated psychological and social impact

Beyond physical effects, STIs can take a heavy psychological toll anxiety, guilt, isolation. Diagnosis often brings shame, fear or self-stigma, which can delay care-seeking and partner communication. Stigma and discrimination disproportionately affect MSM, sex workers, migrants, young women and chemsex participants, amplifying their vulnerability and limiting access to prevention, testing and treatment services.

3- Growing pressure on healthcare systems

The European STI surge is also an economic and organizational challenge. STI management demands substantial medical and financial resources: testing, consultations, treatments, follow-up and hospitalizations when complications arise. Antibiotic-resistant strains especially gonorrhea lengthen and complicate treatment, driving up costs. Strengthening epidemiological surveillance, prevention campaigns and professional training is essential but requires time and budget.

Acting early avoids the human and social cost of otherwise preventable and often curable infections.

STI prevention: Effective strategies

This concerning rise in STIs, confirmed by the latest ECDC data, calls for rapid, coordinated action by health authorities, professionals and citizens. To address this crisis, several preventive strategies are recommended, targeting testing, education, communication, care and surveillance.

Expand regular, free and accessible screening

Early detection, prompt treatment and containment of silent transmission hinge on widespread testing. Establish mobile or community sexual health centers, especially in underserved areas. Offer free tests to asymptomatic individuals and low-income groups to remove financial barriers. Integrate STI screening into routine healthcare particularly in general practice with focus on high-risk groups (young adults, MSM, chemsex participants).

Revamp sex education: relevant, inclusive and mandatory

Effective prevention starts with information. Update school sex-ed programs across Europe for 2025 realities, covering risky practices, consent, relationships, STIs and sexual diversity. Involve local associations, health professionals and educators to deliver a consistent, stigma-free message that respects all sexual orientations and gender identities.

Boost targeted information and prevention campaigns

Just as barrier gestures became commonplace during the pandemic, normalize STI preventive behaviors. Launch modern, audience-specific multimedia campaigns on platforms popular with young adults TikTok, Instagram, YouTube and dating apps using an informative, positive, non-stigmatizing tone. Promote all prevention tools: male and female condoms, PrEP, regular testing, HPV and hepatitis B vaccinations.

Provide rapid, compassionate, comprehensive care

Lower psychological and social barriers to care by creating streamlined pathways: testing ? rapid diagnosis ? immediate treatment ? post-treatment follow-up. Train healthcare professionals to welcome patients without judgment, respecting identities, sexual practices and life contexts (including chemsex). Reducing stigma is key to encouraging care-seeking.

Enhance European epidemiological surveillance

To react swiftly, steer health policies and gauge intervention impact, strengthen real-time data collection and sharing on STIs across Europe. Target prevention more effectively with detailed insights into the most affected regions and groups.

Health professionals: A key role in fighting STIs

As STIs rise in Europe, healthcare professionals (doctors, nurses, pharmacists, midwives, social workers) are central to the response. Beyond clinical duties, they play vital roles in prevention, support and destigmatization, acting with listening, education and proactive vigilance.

Build trust with patients

Taboos and fear of judgment hinder STI prevention. Professionals must address sexual health openly and empathetically, without stereotypes or embarrassment. Simple, non-intrusive questions help identify risks and guide patients to testing or advice. An open, non-judgmental dialogue encourages earlier consultation.

Propose screening systematically

Testing shouldn’t be limited to obvious risk situations. Actively offer screening to young adults, people with multiple partners, MSM or anyone potentially exposed. Since many STIs are asymptomatic, regular tests even without symptoms break hidden transmission chains. Early screening enables simple, effective treatment and prevents long-term complications.

Educate and inform daily

Clinics, pharmacies and health centers are hubs for knowledge. Professionals should promote condom use, HPV vaccination, HIV pre-exposure prophylaxis (PrEP), and low-risk behaviors, tailoring messages to each patient (adolescents, couples, sex workers, people living with HIV) without judgment.

A well-informed professional becomes a credible, accessible prevention advocate.

Report cases and support surveillance efforts**

Beyond individual care, professionals contribute to collective health monitoring. They must notify STI cases to authorities (while respecting confidentiality), feed epidemiological registries and engage in sexual health networks or research. Rigorous surveillance enables rapid public-health response adjustments.

Quick reminder: STIs, symptoms to recognize, treatments to know

STIs are diseases caused by bacteria, viruses or parasites, mainly transmitted through sexual contact (vaginal, oral or anal), with or without penetration. Some may also spread via skin contact or mother-to-child transmission. Many STIs are asymptomatic, making regular screening crucial even without visible signs.

Warning signs of an STI: Symptoms not to ignore

• Unusual genital discharge: abnormal vaginal discharge, urethral discharge in men
• Pain or burning: during intercourse or urination
• Skin lesions: bumps, ulcers, warts or redness on genitals, anus or mouth
• Persistent genital itching
• Pelvic or testicular pain
• Unexplained fever with swollen lymph nodes (often inguinal)
• Abnormal bleeding outside of menstruation

Some STIs, like chlamydia or syphilis, can remain asymptomatic for weeks or months while still being contagious.

Available treatments

The good news: most STIs are easily curable if detected early. Bacterial STIs (chlamydia, gonorrhea) respond well to antibiotics. For viral STIs (HIV, herpes, hepatitis, papillomavirus), treatments can often control the infection for example, daily HIV therapy can render the virus undetectable (and non-transmissible), and vaccines can prevent certain HPV strains. Parasitic STIs (scabies, pubic lice) are treated with creams, pills or shampoos, environmental cleaning is also important. The key: consult promptly to avoid complications and limit transmission.

CONCLUSION

The resurgence of STIs in Europe is not inevitable. It demands a collective response based on science, solidarity and respect for fundamental health rights. Regular screening remains vital, especially for young people, those with multiple partners or high-risk groups like chemsex participants. Partner treatment is also essential to prevent cross-reinfections. Today’s most effective protections include condom use, HPV and hepatitis B vaccination, and PrEP. If in doubt or symptomatic, don’t wait: see a doctor, midwife, pharmacist or sexual health center for rapid care. Sexual health is everyone’s business. Talking about it is already protection—and protecting sexual health actively contributes to public health.