How can doctors tell our temperature by feeling our pulse?

The rate at which the pulse beats and the level of temperature in the body have distinct connection with each other, and go more or less together, so that when the doctor counts pulse rate and finds that it is just the rate it should be, he expects also to find the temperature quite usual. If however, he finds that the pulse is twice as rapid as usual, he will also probably find that the temperature is much higher than normal, because the thing that causes the one to become rapid causes the other to go up.

Thus, in all cases of fever where there is some poisonous substance in the body, this substance causes the heart to beat faster, and the pulse to become rapid, and it also causes a disturbance in that part of the brain controlling the temperature, so that both the pulse and the temperature are thrown out of gear.

More reading:
Pulse (Wikipedia)

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