Why does heart rate increase with fever?

Answer 1

Fever will generally raise your pulse rate.
Through several indirect factors, an infection in your body will raise the rate at which youir heart beats.
This is smart, because you need more blood pumped through your body to deal with the increased metabolic demand the infection has caused.
Also, the body will need to control it's temperature as to not overheat. This is done by three mechanisms in the skin: convection, radiation and evaporation.
The capillaries in your skin will dilate in order to allow a greater flow of core-temperature blood to the skin. Here the core-temperature blood will raise the temperature of the skin and inspire to heat loss via convection (to the surrounding air) and heat-radiation.
Thusly, it is quite normal to have a raised pulse rate when fever-stricken.

A general, but no where near scientific, rule of thumb is that your pulse rate will be raised about 10 pr. degree of raised core body temperature (Celsius).

Answer 2

Fever, by definition, describes an increase in the body's temperature to help fight off an infection. The infection could possibly cause an increased heart rate, but fever is only used to describe a raised body temperature.

Answer 3

because you throw up all your blood and the heart tries to make more causing your heart rate to increase [{H8TER OUT]}

Answer 4

In simple terms, the body's metabolic requirements increase when fighting any kind of infection, thus the heartrate increases to deliver the extra nutrients required around the body.

Answer 5

Yes, fever increases heart rate. The increased temperature is associated with increased metabolic needs. Those needs are met in part though more rapid heart rate.