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.
When endorphins are produced, they can have a variety of effects on the body. Blocking pain: Endorphins affect the part of the brain that controls how you feel pain. When beta-endorphin was injected directly into the brain, it was 48 times more effective at pain relief than manmade opiates.