/ ˌhaɪpəˈkɒndriæk; NAmE -ˈkɑːn-/ noun
a person who suffers from hypochondria :
Don't be such a hypochondriac!—there's nothing wrong with you.
► hypo·chon·driac (also hypo·chon·driacal / ˌhaɪpəˌkɒnˈdraɪəkl; NAmE -ˌkɑːnˈd-/) adjective
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WORD ORIGIN
late 16th cent.: coined in French from Greek hupokhondriakos , from hupokhondria , denoting the soft body area below the ribs, from hupo under + khondros sternal cartilage. Melancholy was originally thought to arise from the liver, gall bladder, spleen, etc.