DSM-5 has “illness anxiety disorder”, defined as preoccupation with the idea that you’re seriously ill, based on normal body sensations (such as a noisy stomach) or minor symptoms (such as a minor rash), to the degree that it gets in the way of normal life. Other features are persistence of such ideas over 6 months, finding little or no reassurance from negative test results or a doctor’s reassurance, repeatedly checking body, avoiding people, places or activities for fear of health risks.
In other words, hypochondriasis. Which gets its name from the idea that such feelings came from liver/spleen/gall bladder (“melancholy” – black bile). William Cullen, in Edinburgh in the 1790s, appeared to take a particular interest in this.
For the sake of diagnosis, this disorder requires the absence of symptoms, which excludes the large group of people who have similar preoccupation and fears about non-specific or unexplained signs and symptoms.
Health anxiety is therefore a broader concept, and can include anyone who is more desperate for relief from worry, than for relief from actual symptoms.
Cyberchondria = combination of increased pathologisation of society, and ability to browse the internet. Because provides the opportunity to find very serious, extremely unlikely explanation for problems.
Diagnosis of health anxiety is well accepted by patients if explained respectfully!