A lingering sore throat, a sudden fever, a persistent cough: these everyday signals often correspond to common infections whose mechanisms remain poorly understood. Quickly identifying the symptoms of a common illness allows for action before it worsens, and especially to avoid contaminating those around you. Influenza, urinary infections, gastroenteritis, or STIs, each pathology follows its own logic of transmission, prevention, and treatment.
Emerging diseases and climate: common infections changing their face
Have you noticed that some previously rare pathologies are regularly back in health news? This is no coincidence. The syndromic surveillance bulletins from Santé publique France show that in the context of high summer temperatures, heat strokes, dehydration, and allergic conditions increase significantly. These ailments, long considered seasonal and benign, are taking on a new scale.
Dengue fever illustrates this phenomenon well. In mainland France, indigenous cases are now reported every summer, transmitted by the tiger mosquito. Chikungunya and the West Nile virus are part of the same dynamic. These vector-borne diseases are gradually being added to the list of infections that general practitioners encounter in routine consultations.
Monkeypox (mpox) follows a similar trajectory. In 2026, the circulation of the virus in France is earlier and more intense than in 2025, with a number of cases already exceeding the total from the previous year. While not a major public health emergency, it serves as a reminder that the list of common diseases is not fixed and evolves with climate change, population movements, and viral mutations.
To delve deeper into these topics and keep up with the news on frequent pathologies, health information on Bien et Vous covers a wide range of diseases and practical advice.
Symptoms of respiratory and digestive infections: distinguishing the trivial from the concerning
Influenza, cold, sore throat, bronchitis: these respiratory infections share similar symptoms. Fever, cough, sore throat, fatigue. The difference often lies in the intensity and speed of onset.
A cold sets in gradually, with a runny nose and sneezing. Influenza hits suddenly, with high fever and intense muscle pain. A sore throat causes sharp pain when swallowing, sometimes accompanied by white spots on the tonsils (a sign of a bacterial origin that may require antibiotics).
On the digestive side, viral gastroenteritis remains the most common infection in France. Nausea, vomiting, diarrhea, abdominal cramps: symptoms appear quickly and generally last a few days. The trap is dehydration, particularly dangerous for young children and the elderly.
When to consult a doctor
A fever lasting more than three days without improvement, breathing difficulties, blood in the stools, or chest pain warrant a prompt consultation. The persistence of symptoms matters more than their initial intensity.
STIs and urinary infections: common diseases still underdiagnosed
Sexually transmitted infections affect both men and women, often without visible symptoms for weeks. This is precisely what makes them formidable.
- Chlamydia infection is the most widespread bacterial STI. It often goes unnoticed, but can cause pelvic pain and, in women, complications related to fertility if left untreated.
- Genital herpes manifests as painful blisters during outbreaks, but the virus remains present in the body for life. Antiviral treatment reduces the frequency and intensity of outbreaks.
- HIV remains a major public health concern in France. Regular testing and pre-exposure prophylaxis (PrEP) are the two pillars of prevention for at-risk individuals.
- Gonorrhea and syphilis have seen a resurgence in recent years, with increasingly antibiotic-resistant strains of gonorrhea.
Regular STI screening is the only reliable way to detect an asymptomatic infection. A simple swab or blood test is sufficient in most cases.
Urinary infections: not just a women’s issue
Urinary infections predominantly affect women, but men are not spared, especially after age fifty. Burning during urination, frequent urges to urinate, cloudy urine: these signs should lead to a cytobacteriological examination of urine (ECBU) to identify the causative bacteria and adjust antibiotic treatment.
Prevention of common diseases: actions that really reduce risk
Prevention relies on simple but often neglected mechanisms. Handwashing remains the most effective action against the transmission of viruses and bacteria. Water and soap for about twenty seconds are enough to eliminate the vast majority of pathogens present on the skin.
Vaccination is the second major lever. Seasonal influenza, pneumococcus, hepatitis B, human papillomavirus: each vaccine targets a specific risk. Vaccination recommendations evolve each year based on the circulation of pathogens.
For STIs, using condoms during sexual intercourse remains the most reliable barrier. Regular testing complements this protection, as some infections can be transmitted despite precautions (herpes, human papillomavirus through simple skin contact).
Treatments: antibiotics, antivirals, and self-medication
One point deserves clarification. Antibiotics only work against bacteria, never against viruses. Taking an antibiotic for influenza or a cold is pointless and contributes to antibiotic resistance, a growing public health issue.
- Bacterial infections (strep throat, urinary infection, certain STIs): targeted antibiotic treatment after diagnosis.
- Viral infections (influenza, cold, gastroenteritis): rest, hydration, antipyretics. Antivirals are only prescribed in specific cases (severe influenza, herpes, HIV).
- Self-medication: acceptable for mild symptoms (paracetamol, saline solution), but dangerous as soon as symptoms persist or worsen.
Enteroviruses, closely monitored by sentinel networks in France, remind us that even common viruses can cause a variety of clinical presentations, ranging from a simple cold to rare neurological complications. Vigilance remains essential, even against infections that are believed to be perfectly controlled.
Each season brings its share of pathologies, and the line between benign illness and serious complication often depends on the speed of intervention. Recognizing the first symptoms and consulting without delay when they persist remains the best strategy, well before any treatment.