Eastern traditions have long been more aware of a mind/body connection than the modern Western medical profession which has based much of their thinking on the theory put forward by Descartes who was a French philosopher in the 1600’s. He believed that the mind and body were separate entities which had no influence on the other.
Modern medicine is a reflection of this, and is shown by the desire to remove symptoms of an illness rather than addressing any underlying mental/emotional issues that could contribute to an illness. Compare this to traditional Eastern healing systems where illness is considered to be an imbalance in the energy (Qi or Chi) which in turn affects the mental/emotional and physical body systems.
Western science has since discovered that the impulses to the cells can be affected by either negative or positive thoughts, thus having an effect on things such as immunity and health. Previously thought to only be present in the brain, these neurotransmitters have been discovered in other major organs such as the heart and gut. A regular meditation practice can help to still the mind and help with general health. Checking in on your thoughts and changing or reframing them to a more positive attitude will also help. For instance if you find yourself saying “I should…….”, change the language to “I choose to……” and notice the difference.