Cold sore: Viruses or localised infections can cause the eye to redden â the problem usually starts in one eye, but can spread to both. The cold sore virus, which 90 per cent of us carry, can sometimes also infect the eye, causing inflammation.
Endorphins are chemicals, called peptides, that are made in the body. They have much of the same effect on a person as opium or morphine. As a result, they actually lower the feeling of pain in the body and can create a feeling of bliss or euphoria.
These neurochemicals are called endorphins. While endorphins might make you feel good after a long jog, thereâs a lot more to know about the role they play in regulating your body. The word endorphin comes from putting together the words âendogenous,â meaning from within the body, and âmorphine,â which is an opiate pain reliever. In other words, endorphins got their name because they are natural pain relievers.