Homeopathy believes in a Holistic, and Individualistic approach; i.e. the Human body is one whole unit of numerous organs and not multiple isolated units which we consider separately as brain, heart, lungs, kidney, joints, skin, etc. When a person is ill; it's just not an organ/part that is diseased but the person as a whole is ill. That is why, during Homeopathic treatment, every person is studied and treated as an individual