Causes and Symptoms of Infectious Diseases

Infectious diseases are caused by pathogens such as bacteria, viruses, fungi, and parasites. Bacterial infections like pneumonia or tuberculosis, viral diseases such as flu or COVID-19, and fungal infections like athlete's foot can all lead to various symptoms. Common signs include fever, fatigue, pain, swelling, and respiratory issues like cough or sore throat. Digestive symptoms, such as nausea, vomiting, and diarrhea, are also common in infections like gastroenteritis. Early diagnosis and treatment are vital, as is prevention through good hygiene, vaccinations, and proper sanitation, especially in high-risk areas.