Apart from lifestyle disorder, pollution, heredity, our thoughts and emotions are highly related with our well beingness/disease. Almost all of the diseases arises due to the habit of unforgiveness.
Excessive feel of Fear and Tension- Baldhead, Ulcer
Too much of resentment or irritation or anger - Becomes the disease called cancer
Self criticism and self hurt - Leads to arthritis
Excessive feel of guilt - Create pain into body
You Can Heal Your Life, Part II by Louise L. Hay
You can watch few of her videos at: https://www.youtube.com/watch?v=QmCLfVRxgtw