1) Anxiety 2) Anxiousness 3) Hypochondriasis 1) Hyp 2) Hypochondriasis 
• (pl. ) of Hypochondrium • (n.) Hypochondriasis; melancholy; the blues.
(hi″po-kon´dre-ә) plural of hypochondrium. hypochondriasis.
An imagined ailment, without physical evidence - An unnatural preoccupation with one`s health - It does not have (in a medical context) the every day meaning of a fear of ill health. True hypochondria is a debilitating symptom of severe mental illness like depression, severe anxiety or hysteria
Hy`po·chon'dri·a noun [ New Latin ] (Medicine) Hypochondriasis; melancholy; the blues. 
Type: Term Pronunciation: hī′pō-kon′drē-ă Synonyms: hypochondriasis
Hypochondria: 1. Synonym for the disorder officially called hypochondriasis. 2. The plural of hypochondrium, referring to both sides of upper abdomen just below the rib cage. The ancients believed hypochondiasis was due to disturbed function of the organs of the upper abdomen.
[n] - chronic and abnormal anxiety about imaginary symptoms and ailments
A term used to refer to premitochondriate eukaryotes. 
an excessive preoccupation with one's health, usually focusing on some particular symptom, as cardiac or gastric problems. · excessive worry or talk about one's health.