1909 in biology, in reference to bodily symptoms indicating mental disorder; 1920 in psychology, "conversion of emotional states into physical symptoms;" from somato- "body" + -ization.
Entries linking to somatization
somato-
before vowels somat-, word-forming element used in the sciences from mid-19c. and meaning "the body of an organism," from combining form of Greek sōma (genitive sōmatos) "the body, a human body dead or living, body as opposed to spirit; material substance; mass; a person, human being; the whole body or mass of anything," a word of uncertain origin.
According to Watkins perhaps originally "compactness, swelling," and from PIE root *teue- "to swell," but Beekes finds for it "no convincing etymology." In Homer sōma is typically "dead body," as opposed to demas "living body, bodily shape, outward appearance;" in philosophy it is opposed to psykhē "the soul, mind, spirit." The Greek word also was used generally of material substances and physical masses.
-ization
word-forming element making nouns of action, process, or state; see -ize + -ation.