A woman in her mid-forties emailed me recently.

She is suffering from symptoms of cognitive decline, yet thorough cognitive testing shows no abnormality. She's seen her primary care doctor, who's given her the basic screening tests for the causes of dementia that can be tested for, and they're all normal. Doctors have suggested that emotional issues (for instance, depression) are the most likely cause (a reasonable possibility that she was willing to consider), but a year of anti-depressants hasn't changed her cognitive symptoms.

By definition, then, she has subjective cognitive decline (SCD) and is wondering how to deal with it.

The only relevant medical test she hasn't had is a PET scan for amyloid to look for evidence of Alzheimer's. As I've written, the scan can only tell you that you don't have Alzheimer's, not that you do. Anywhere between 20 and 30 percent of those with a positive scan don't, in fact, have Alzheimer's disease. Unfortunately, too, the scan costs about $4,000, and health insurance may not cover it.

As a doctor concerned about health care costs spiraling out of control, I would myself be hesitant to order such a test since it wouldn't change treatment one bit. (In fact, as a patient, I did decline my doctor's offer to get the scan and only had it eventually as part of a research study.) Regardless of how the scan turns out, however, there's nothing to do about it.
In my own case, what I needed most was reassurance that I wasn't crazy; that, regardless of the normal objective tests, my symptoms were real and not imaginary. I sensed the same need in this woman's email. Her complaints are real.

SCD is a recognized medical phenomenon. While medical researchers are only beginning to evaluate it, studies so far have indicated that SCD is strongly correlated with an eventual diagnosis of Alzheimer's.

She wanted any help I could suggest about what was going on and what she could do. Here's some of what I wrote (or wish I had written) back:

So why are you having such disturbing symptoms, in spite of the normal test results? There are a couple of possibilities. First, you may have had a very high intelligence, giving you a significant "cognitive reserve." You know you've declined, but you're still well within "normal" range, which is just what you'd expect the tests tell you.

A neuropsychologist mentioned another possibility to me: There are groups of people (she mentioned doctors especially) who—probably as a result of how they were selected for medical school and how they've been trained—just do much better on tests than they do in their everyday life. They know something's wrong, but they're just too good at taking tests for it to show up. One important thing is to recognize that you've done everything possible to have your symptoms evaluated.

For most people in a situation like this, half of the worrying and anxiety is wondering whether they should keep fighting for a definitive diagnosis. In your case, the answer appears to be, "No."

So what can you do?

You're a physician who's appropriately worried that other people's lives depend on your cognitive capacities, so you want to reassure yourself that you're not putting patients at risk. I haven't looked into it, but I would suspect that there are places that will assess you anonymously—for instance, a training hospital or state medical society. (Especially if your capacity as a physician is not objectively compromised, you don't want to be forced into retirement by overzealous administrators trying to cover their butts if rumors get out.)

In your email, you've shown honesty and integrity in revealing yourself. If it were to turn out that you shouldn't be practicing, I'm confident you would back off quickly without needing an outside push.

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Work at not torturing yourself about whether your symptoms are "real" or not. If they're due to some emotional cause, so be it. You've already done what you can to check that out, so let it go. Wait and see. Recognize that your spiritual task right now is to live with the uncertainty you've been given. Your situation can be a learning laboratory for spiritual growth.

Most of us need to learn patience. Here's a place to practice. There's nothing to do; only live with who you are and what you've been given.

Can you accept the uncertainty as your opportunity to learn to live with it without exacerbating your suffering?

The Buddhists point out (not in these words) that the only thing worse than being in a miserable situation is attaching yourself to the goal of getting out of it and, therefore, fighting it.

That approach rarely ends happily.