What can bad bacteria cause in the human body?

Bad bacteria, often referred to as pathogenic bacteria, can cause a variety of diseases in the human body. These microorganisms can disrupt normal bodily functions and lead to infections, which may manifest in various forms such as gastrointestinal disturbances, respiratory infections, skin infections, and more serious conditions like sepsis or pneumonia, depending on the type of bacteria and the site of infection.

When harmful bacteria invade the body, they can multiply and produce toxins, which can damage tissues and provoke an immune response. This immune response can further lead to symptoms associated with infectious diseases, such as fever, inflammation, and pain. Understanding the impact of pathogenic bacteria is crucial in medical science, as it informs prevention and treatment strategies, such as vaccinations and antibiotic use.

In contrast, the other options describe beneficial effects that are typically associated with good bacteria in the body, which contribute to hydration, structural support, and nutrient uptake, highlighting the importance of maintaining a healthy microbiome.