Chills

Chills are a natural mechanism for your body to raise its core temperature. Chills are caused by cold weather, viruses, infections, and other illnesses. Shivering causes your muscles to relax and contract. Your body heats up as a result of this unintentional activity. When you have chills, you may: shiver or tremble; shake; have chattering teeth; or have goosebumps (also known as gooseflesh or goose pimples).

Pyrogens trick your body into thinking it's cold and wants to warm up, therefore they frequently accompany a fever. But chills aren't experienced by everyone who has a fever. You can have chills even if you don't have a fever. Chills are a typical sign of a fever, which can be caused by a variety of illnesses, including food poisoning.