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.
Endorphins. Endorphins are your body's natural painkillers. First discovered in 1975, they are proteins that work in a similar way to the painkiller morphine. The word 'endorphin' is actually an abbreviation of the words endogenous (meaning produced by the body) and morphine.ndorphins are your body's natural painkillers. First discovered in 1975, they are proteins that work in a similar way to the painkiller morphine.