Why do fever get worse at night?


Fever is a natural response of the body’s immune system to fight off infections and other illnesses. It is typically characterized by an increase in body temperature above the normal range of 98.6°F (37°C).

Fever can often feel worse at night for a few reasons. First, the body’s circadian rhythm, or internal biological clock, can affect the way it regulates temperature. Body temperature tends to be slightly lower during the early morning hours and slightly higher in the late afternoon and evening. This means that fever symptoms may be more pronounced at night when body temperature is naturally higher.

Second, fever can cause other symptoms that may be more noticeable at night, such as chills, sweating, and body aches. These symptoms can make it harder to sleep, which can further exacerbate feelings of discomfort and fatigue.

Finally, fever can be a sign that the body is actively fighting off an infection or illness, and the immune system may be more active at night. This increased immune activity can cause inflammation and other symptoms that contribute to the sensation of feeling worse at night.

It’s important to note that while fever can be uncomfortable, it is often a sign that the body is working to heal itself. If you are experiencing fever, it is important to stay hydrated, get plenty of rest, and seek medical attention if your symptoms are severe or prolonged.

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