Contrary to our Western medicine, the Oriental one and Zen Buddhism consider Mind and Body as an unbreakable single unit in which each part affects the other back and forth and continuously and at different degrees. Body functions, thoughts and emotions are the jobs of our subconscious and conscious mind and our brain which is made of contains around 100 billions neurons.
Recently, millions of neurons have been identified in our small and large intestine. There is a subconscious thinking and emotional loop between brain and intestines.
Rational thinking does not affect our body but our emotions, even at their subconscious level, could have significant impacts on various organs.
In our Western world, the way we define and delimit Self that is you, others and me living beings is very arbitrary, restrictive, too materialistic.
This “individual self” is just a biological organism made of around 30 trillions cells and trillions of trillions of atoms generating our body and mind and their physical and mental functions.
Self does exist but, we have been conditioned by our Western education, philosophy and religions to view ourselves as a unique, independent and separate entity, different from every other living beings.