What are the symptoms of hemorrhagic fever?

Hemorrhagic fever is an acute infectious disease whose symptoms may include high fever, headache, nausea and vomiting, congestion, hypotension, and others. A detailed analysis is as follows:

1. High fever: After the virus invades the human body, it triggers an immune response and the release of inflammatory mediators, leading to dysfunction of the body's temperature regulation center and resulting in high fever. In the early stage of infection, the patient’s body temperature rises rapidly, often exceeding 39°C.

2. Headache: Following viral invasion, large amounts of inflammatory factors are produced in the body. These factors stimulate the nervous system, causing severe headaches. Meanwhile, the virus may also invade muscle tissues, leading to myalgia.

3. Nausea and vomiting: Most patients experience reduced appetite; more severely affected individuals may suffer from nausea, vomiting, and hiccups. Vomiting is typically non-projectile and consists mainly of gastric contents.

4. Congestion: This is primarily manifested as the "three reds" symptoms—flushing and congestion of the skin on the face, neck, and upper chest. Petechiae or ecchymoses may appear on the skin and mucous membranes, commonly seen in the bilateral axillary regions and back.

5. Hypotension: This occurs when body temperature begins to drop or shortly after defervescence. The patient's blood pressure starts to fall, manifesting as dizziness, palpitations, sweating, and other symptoms. As blood pressure continues to decline, shock may develop.

If any bodily discomfort occurs, it is recommended to seek prompt medical attention at a hospital and follow medical advice for treatment.