Iris (Definition) The iris is a structure within the eye that helps reduce the amount of light that reaches the retina. The iris is known as the colored part of the eye, and can be blue, brown, or any color or combination of colors in between. The iris is the portion of the eye that responds to light stimulation. ...Read more.
Scientists also speculate that caffeine may provide a mood-boosting effect that helps ease pain. Regardless of the mechanism by which it works, the data does indicate that caffeine does indeed make pain medications more effective and help ease pain.
I've seen a very strong correlation between caffeine use & pain. Caffeine makes every muscle in your body more tense, including the involuntary muscles in the internal organs. If a massage therapy client stops or starts using caffeine, I can feel a difference in their body, they have more muscle tension with caffeine. Increased muscle tension leads to pain. Getting off caffeine can reduce your pain, and sometimes eliminates pain. Cutting down from a lot to a little helps.