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 natural pain killing substances found in the human brain. The name comes from endogenous (meaning within) and morphine (morphine being a pain killer).his is due to an elevation in endorphins, which are the body's natural pain reduction and pleasure chemicals that are produced in the brain. After time, more and more nicotine is needed to achieve the same pleasurable feeling, leaving the smoker addicted.