5. Fever
When your body has an infection, one of the most common reactions is fever. This is a complex biological response that does not only increases your body temperature but also causes a series of metabolic and physiological changes aimed to better fight and eventually defeat the infection.
As a consequence of the febrile state, your heart can beat faster, and you can experience heart palpitations. In other words, if you have a fever and you start feeling palpitations, normally it doesn’t mean that your illness is getting worse, but rather it’s just part of the same febrile reaction that affects the rest of your body.
These palpitations can even affect you if you are resting or sleeping, and could happen along with other normal manifestations of fever such as increased sweating and muscular pain. If you have a fever, remember to stay hydrated, because dehydration can make your heart palpitations last for longer.