A disease is defined by an alteration of the normal functions of the body, whether caused by an infectious agent, an internal disorder, or an environmental factor. Understanding the various diseases, their symptoms, and their treatments first requires distinguishing the major mechanisms that trigger them, as a bacterial infection is not managed in the same way as an autoimmune disease or cancer.
Antibiotic Resistance and Proper Use of Antibiotics: What Changes in Infectious Treatments
Antibiotics remain the reference treatment for bacterial infections (sore throat, pneumonia, urinary infection). Their effectiveness decreases when bacteria develop resistance, a phenomenon that the High Authority of Health (HAS) qualifies as a major threat to public health.
The HAS has updated its recommendations on the proper use of antibiotics in everyday practice. The goal: to limit unnecessary prescriptions, particularly in viral infections where these medications have no effect. An acute bronchitis, for example, is viral in the vast majority of cases and does not justify antibiotic therapy.
As a patient, several reflexes protect the effectiveness of these treatments. Respecting the prescribed duration, never reusing leftover antibiotics without medical advice, and accepting that a doctor may not prescribe antibiotics when the diagnosis points to a viral cause. Detailed fact sheets on each infectious disease and its appropriate treatments are available on the relais-sante.com website, which helps to better understand when a consultation is necessary.
Infectious Diseases: Symptoms According to the Type of Infection
Infectious diseases are classified according to the responsible pathogen (virus, bacteria, parasite, fungus) and according to the affected organ. Each location produces characteristic symptoms that guide the diagnosis.
Respiratory and Digestive Infections
Respiratory infections (flu, Covid, pneumonia, bronchitis) share a common set of symptoms: fever, cough, fatigue, and sometimes breathing difficulties. The flu is distinguished by a sudden onset with intense muscle pain, while a cold progresses gradually with a predominant nasal discharge.
Digestive infections (gastroenteritis, hepatitis A) cause nausea, vomiting, diarrhea, and abdominal pain. Hepatitis, whether type A, B, or C, can also manifest as jaundice and prolonged fatigue over several weeks.
Skin Infections and STIs
Skin infections (abscesses, mycoses, shingles) are identified by visible lesions: redness, swelling, blisters, itching. Sexually transmitted infections (chlamydia, gonorrhea, syphilis) often remain asymptomatic for weeks or months, complicating their detection without voluntary screening.
Vaccination Prevention: Recent Recommendations to Know
Vaccination remains the most documented prevention lever against infectious diseases. Recommendations regularly evolve based on epidemiological data and new vaccines available.
The HAS now recommends the PREVENAR 20 vaccine against pneumococcal infections for infants and at-risk children. For at-risk adults and individuals aged 65 or older, the CAPVAXIVE is preferred. This differentiation based on age and risk profile reflects a more targeted approach than previous vaccination schedules.
Another notable evolution: the systematic screening for cytomegalovirus (CMV) during pregnancy has become a recommendation in France. CMV can cause neurological damage in the fetus, and early screening allows for appropriate management.
- Check your vaccination record at least once a year, especially after age 50 or in case of chronic illness
- Consult a doctor before traveling to a tropical area for specific vaccinations (hepatitis A, yellow fever, meningitis)
- Report any ongoing pregnancy to the doctor to benefit from CMV screening and appropriate booster vaccinations
Non-communicable Chronic Diseases: Diagnosis and Prevention in Daily Life
Cancer, diabetes, cardiovascular diseases, and chronic respiratory conditions are the leading causes of mortality worldwide. Unlike infectious diseases, they are not transmitted from person to person but result from a combination of genetic, behavioral, and environmental factors.
Early diagnosis radically changes the prognosis of these conditions. A colorectal cancer detected at a localized stage is treated much more effectively than an advanced form. Type 2 diabetes identified by a simple fasting blood sugar can be stabilized before the onset of renal or vascular complications.
Prevention relies on known but difficult-to-maintain levers over time:
- Regular physical activity reduces cardiovascular risk, improves glycemic control, and contributes to the prevention of certain cancers
- Quitting smoking decreases the risk of lung cancer, chronic obstructive pulmonary disease (COPD), and arterial diseases
- Organized screening (breast cancer, colorectal cancer, cervical cancer) allows for detection at a stage where treatments are most effective
- Regular blood pressure monitoring after age 40 identifies often silent hypertension, the primary risk factor for stroke
The difference between knowing and applying remains the main obstacle in public health. Prevention campaigns inform, but regular medical follow-up remains the only reliable safety net to detect what symptoms do not yet reveal.
Whether the disease is infectious or chronic, the approach remains the same: identify warning signs, consult a doctor for a diagnosis, and adapt treatment to the individual case. Recommendations evolve every year, making the connection with a healthcare professional even more necessary to stay updated on prevention and management strategies.
