/ ˌhaɪpəˈkɒndriə; NAmE -ˈkɑːn-/ noun
[ U ] a state in which sb worries all the time about their health and believes that they are ill / sick when there is nothing wrong with them
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WORD ORIGIN
late Middle English : via late Latin from Greek 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.