endorphin

When undergoing surgery, red-haired people need anesthesia or take pain medicine at a higher dose than those with dark hair, according to research by British experts.

New research shows that sunlight stimulates the production of endorphins, a chemical that relieves pain and feels refreshing, causing mice with symptoms like addiction.

Laughing with friends will release brain chemicals to create a positive feeling, while reducing pain, according to the latest research by British scientists.