Alert

Shaking chills (rigors)

Shaking chills (rigors) are the body's reaction to a severe infection or the release of organisms, such as viruses or bacteria, into the bloodstream. These chills often occur with a high fever and sometimes make teeth chatter or, when severe, can cause uncontrollable shaking that can make a bed vibrate.

Symptom Checker

Feeling under the weather?

Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.

Interactive Tools

Get started learning more about your health!

Our Interactive Tools can help you make smart decisions for a healthier life. You'll find personal calculators and tools for health and fitness, lifestyle checkups, and pregnancy.