Severe infections are serious health conditions caused by harmful germs like bacteria, viruses, or fungi. When these germs invade the body, they can multiply quickly and overwhelm the immune system, leading to symptoms such as high fever, extreme fatigue, and difficulty breathing. Common examples of severe infections include pneumonia, sepsis, and meningitis. If not treated promptly, severe infections can lead to serious complications or even death. Medical professionals often use antibiotics or antiviral medications to combat these infections, along with supportive care like fluids and oxygen. Early detection and treatment are crucial for improving outcomes and saving lives.