The doctor concluded that his stomach pain was psychogenic, not caused by any physical illness.

psychogenic 是由词根 psycho-（心理、精神）和 -genic（产生、引起）组成的形容词。psycho- 来自希腊语 psyche（灵魂、心灵），-genic 来自希腊语 genos（起源、产生）。psychogenic 合起来表示"由心理因素引起的"。