Hemorrhagic fever refers to a group of illnesses caused by several different viruses, leading to severe symptoms, including fever, bleeding, and organ failure. Common types include Ebola, Dengue, and Marburg fever. These diseases are often transmitted through contact with infected animals or humans, and they can spread rapidly in certain environments. Symptoms typically appear within a few days to two weeks after exposure and may include high fever, fatigue, and bleeding from various body parts. Diagnosis is crucial for treatment, and supportive care is often required. Preventive measures include avoiding contact with infected individuals and maintaining proper hygiene.