Why is a high fever dangerous?

A high fever is considered to be a body temperature of 104°F (40°C) or higher in an adult. It can be dangerous for a number of reasons:

1. Dehydration: A high fever can cause rapid loss of fluids through sweating and increased respiratory rate. This can lead to dehydration, which can cause weakness, dizziness, confusion, and in severe cases, seizures or even death.

2. Organ damage: A high fever can cause damage to the brain, kidneys, liver, and other organs. In particular, a high fever in children can lead to febrile seizures, which can cause permanent brain damage.

3. Worsening of underlying medical conditions: A high fever can worsen underlying medical conditions, such as heart disease, lung disease, and diabetes. For example, a high fever can increase the risk of heart attack or stroke in people with heart disease, or it can worsen asthma in people with lung disease.

4. Increased metabolic rate: A high fever can increase the body's metabolic rate, which can lead to increased oxygen consumption and a faster heart rate. This can put stress on the heart and lungs, especially in people with heart or lung conditions.

5. Discomfort and restlessness: A high fever can cause significant discomfort and restlessness, making it difficult for the person to rest and recover.

Therefore, it is important to seek medical attention if a person has a high fever, especially if they are a child, an older adult, or have an underlying medical condition.