Health anxiety and OCD: close cousins, same engine
Both run on doubt, checking and reassurance that never lasts. Understanding health anxiety as OCD's close relative explains why the usual advice fails and what works.
People with health anxiety are often surprised when I tell them I approach it much the way I approach OCD. They do not think of themselves as having OCD. They do not wash their hands or check locks. They are worried about their health, which seems a different kind of thing altogether.
But look at the mechanism rather than the subject and the resemblance is close. Health anxiety and OCD are cousins, and understanding that explains why so much of the usual advice fails, and what actually works.
Doubt, check, relief, doubt
OCD runs on a loop. An intrusive doubt arrives: did I lock the door, did I contaminate that, does this thought mean something about me. The doubt is unbearable. Something is done to resolve it: checking, washing, mentally reviewing. The relief is real and brief. And then the doubt returns, because the checking has just taught the brain that the doubt was worth acting on.
Now put health in the place of the door. A sensation arrives, and with it a doubt: is this serious? The doubt is unbearable. Something is done to resolve it: searching, scanning the body, asking someone, seeing the GP. The relief is real and brief. And then the doubt returns, reformulated, because the checking has just confirmed that the sensation was worth investigating.
The subject is different, but the machinery is identical, and it is the machinery that treatment addresses.
What does not work
Because the engine is the same, the things that fail in OCD fail here too.
Reassurance fails. In OCD, being told "you definitely locked it" helps for an hour and then the doubt says "but what if". In health anxiety, being told "the test was clear" helps for a day and then the doubt says "but what if they missed it". Reassurance is a check that someone else performs for you, and it feeds the loop exactly as your own checks do.
Willpower fails. Deciding not to search, in the same way a person with OCD decides not to wash, tends to last until the anxiety peaks and then collapses. The loop has to be dismantled by finding out, in practice, that the doubt subsides without being answered.
Arguing with the doubt fails. Marshalling the evidence that you are probably fine gives the doubt hours of attention, and attention is what it runs on. The doubt needs to be carried rather than answered.
What works
Because the engine is the same, the treatment that works for OCD works here. CBT built around exposure and response prevention: gradually approaching the sensations and uncertainties that the fear has ruled unsafe, and not performing the check, so that you can find out what the anxiety does when it is not fed. It rises, then it falls, and the sensation, which was mostly being kept alive by attention, fades.
Alongside that, we work on the beliefs about uncertainty that drive the whole thing. In OCD, the demand is for certainty that the door is locked, the hands are clean, the thought means nothing. In health anxiety, the demand is for certainty that the body is well. Neither certainty is available to anyone. Learning to carry an open question, without processing it constantly, is the skill that both conditions need.
Where the resemblance ends
I should say where the two differ, because it matters practically. Health anxiety involves real bodies, and real bodies sometimes need real doctors. Therapy never asks you to skip sensible medical care. If a symptom is new and significant, you see a GP. What we treat is the checking and fear that continue after reasonable medical reassurance has been given, which is the part the loop owns.
And some people have both. Health anxiety sits alongside other OCD themes more often than you would think, because the engine, once running, is not fussy about subject. If that is your picture, the same treatment covers both, and I work with both.
The good news in the resemblance
If health anxiety is OCD's cousin, then it shares OCD's most encouraging feature. The loop is very specific, and interrupting it produces change that people can feel within weeks. Most people find the noise fades far faster than they expected once the checking is retired. A typical course runs 8 to 14 weekly sessions, and we track progress against getting your time and attention back, never against a certainty that nobody can give.
If you have been treating health anxiety as a health problem and getting nowhere, there is more on how I treat health anxiety, and on the OCD work it borrows from.