Shivers

Shivers are involuntary muscle contractions caused by the body's response to cold or emotional stimuli. When you're cold, your body shivers to generate heat through rapid muscle movements. Similarly, strong emotions like fear or excitement can trigger shivering as part of the body's reaction. These muscle contractions help maintain core temperature or respond to emotional states, serving as a natural and automatic process regulated by the nervous system. While often temporary and harmless, persistent shivering may indicate underlying health issues requiring medical attention.