A chakra is a point on the body that holds energy. It's a Buddhist belief, but it makes sense. There are places in us, knots of nerves or other things, that cluster together. The groin, the stomach, the heart, the eyes, and a few other points. The stomach is the core, and you know how getting hurt can make you nauseous? This is sort of the same idea. Whatever's happening is affecting us because it hurts. Maybe on a spiritual level.