Medicine has been around for thousands of years, during most of which it was an art (an area of skill and knowledge) frequently having connections to the religious and philosophical beliefs of local culture. For example, a medicine man would apply herbs and say prayers for healing, or an ancient philosopher and physician would apply bloodletting according to the theories of humorism (chemical systems regulating human behavior). Suggested that humours are the vital bodily fluids, such as blood, yellow bile, phlegm and black bile* or in Ayurveda Vatta-air, Pita-bile and Kapha-phlegm
*Wikipedia.