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.
Beta-endorphins can enhance a person's mood and create feelings of relaxation. Beta-endorphins are substances created by the pituitary gland. Yoga and other exercise spurs the pituitary gland to create more endorphins, the body's natural pain medication. B-endorphins circulate around the spinal cord.