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 are defined as hormone-like substances that are produced in the brain and function as the bodyâs natural painkillers. During exercise, these endorphins are released, and this can produce feelings of euphoria and a general state of wellbeing.he endorphins produced can be so powerful that they actually mask pain. Physically active people recover from mild depression more quickly and physical activity is strongly correlated with good mental health as people age.