Dr. Bruce Lipton writes about the concept of how emotions effect the cells in his book Biology of Belief. I recommend this book to everyone who is really interested in learning about the science of it all.
And, I enjoy coming across articles that just keep on supporting this theory. There is one from life hack.org entitled Cancer Linked to Unexpressed Anger, Studies Say.
You can read it here
It shares some wonderful tips to express anger in a healthy way too.
If you need more personal assistance learning about or dealing with negative emotions in your life, we at Know Thyself Coaching Institute not only teach you how you can release them for yourself, we also can provide referrals to our many skilled practitioners across the globe.