The word prakriti means "nature" or natural form of the build and constitution of the human body. Pra means the "beginning", "commencement" or "source of origin" and kruthi means "to perform" or "to form". Put together, prakriti means "natural form" or "original form" or "original source". Disease occurs when there is a change in this original form at the psychological or physiological level.
Ayurveda lays emphasis on examining the prakriti or the natural state of an individual first. The disease vikruthi is examined later. While the expert in modern medicine analyses the disease, the Ayurvedic expert is also interested in the individual who is suffering from the disease.