Radio frequency treatment of tumors while inducing hypotension

In the method of treating a naturally occurring tumor in a human by placing the portion of the body of the human in which the tumor is located in a radio frequency electromagnetic field thereby to heat the tumor tissue in said portion of said body by absorption of energy from said radio frequency electromagnetic field for a period of time and with intensity sufficient to cause necrosis of said tumor, but insufficient to cause significant damage to the adjacent normal tissue in said field, the improvement which comprises inducing hypotension in said human while treating said tumor with said radio frequency electromagnetic field.