I think if any part of the system we live in (body mind spirit) is damaged it has running effects into the others,same with some parts of the body, when break downs in links form through dis ease then an organ can be out of balance etc. Just to sound even crazier I also personally think (being a life form) even the ground we live on can have its effects.The people around us,what they say, but mostly what we believe is our due,your body will eventually follow your deeper feeling.