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.
3. Endorphins. What they do: Endorphins are a group of neurotransmitters formed within the body that bind to opiate receptor sites in your brain to naturally relieve pain. The bio-chemicals acetylcholine and dopamine are known as endorphins, and have a similar chemical structure to morphine. They are also known to lower stress and boost confidence. How they make you feel: Endorphins produce feelings of euphoria and pleasure, and they have a calming effect.