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The New Therapist
with Anthony D. Smith, LMHC

Improving Diagnostic Accuracy: Medical Mimicry, Part 1

As promised, in the next several posts we will continue examining other stumbling blocks to accurate diagnosis that have relatively easy fixes. Perhaps the most overlooked diagnostic consideration is that the patient’s presentation is caused, or perhaps exacerbated by, a general medical/physical condition. In fact, at the end of each diagnostic category in the DSM, there is listed a diagnostic code reserved for just such occasions: “Due to Another Medical Condition.” Examples may be found on pages 145 and 260 of the DSM 5. In most diagnostic categories, practitioners are also reminded to keep vigilant for this. If you look at criteria for, say, Schizoaffective Disorder (DSM 5, page 105), Criterion D stresses, “The disturbance is not attributable to the effects of a substance…or another medical condition.”

“Due to Another Medical Condition” is for acknowledging that some medical problems can mimic mental health conditions. It is not that the person isn’t psychologically-suffering, but the symptoms are medically-driven and require physician intervention, not a therapist. Of course, someone may need help coping with a certain medical condition, and a therapist can indeed be helpful.

A cursory look at available literature (e.g., Gleason, 2015; McKee & Brahm, 2016; Welch & Carson, 2018) on psychiatric diagnosis/misdiagnosis can reveal numerous articles stressing the importance of assessing for general medical/physical etiology. Over the years, I’ve heard two frequent excuses for this being overlooked. Even though it is standard practice for intake documents to have a general medical history section that would seem to be a reminder, the first is simply, “I forgot about physical possibilities.” This is understandable, especially for less-experienced practitioners, given we’re largely trained to see the patient’s problems through a psychogenic lens. Because of this reflexive tendency, practitioners move in like a SWAT team, aiming to categorically snipe out symptoms, under the assumption those symptoms are within patient control if only we can reach them with our bags of tricks.

The second reason medical etiology often seems to be overlooked is that many clinicians seem to feel they’re overstepping a boundary if medical conditions enter the discussion. However, I have yet to see a rule that says non-medical practitioners cannot address the possibility that a mental health diagnosis is caused, or exacerbated, by a general medical condition. We are not diagnosing or treating a physical problem. Those actions are forbidden barring the appropriate medical degree! We are simply considering what may be causing the psychological suffering. In fact, it would be rather unethical if we did not consider medical etiology; by trying to use talk therapy to manage something that needs medical intervention is neglectful. To illustrate, when clients complain of panic symptoms, I ask if they have diabetes or if the symptoms seem to occur around mealtimes. While not the norm, sometimes they answer in the affirmative and I suggest they visit an endocrinologist. More than once symptoms were deemed to be from insulin problems. If I tried to apply CBT-based panic interventions for an insulin problem, they’d be coming to sessions week after week without progress, all the while their medical condition likely getting worse.

Hopefully it is now obvious why sound diagnostic practice includes consideration if a person’s symptoms may be influenced by a general medical condition. In Parts 2 and 3 of Medical Mimicry, we’ll learn how to evaluate for if medical problems may be influencing the clinical picture.


Diagnostic and Statistical Manual of Mental Disorders: Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition. Arlington, VA: American Psychiatric Association, 2013.

Gleason, O.D. (2015, May). Introduction: the connection between medical illness and psychiatric disorders. Psychiatric Times, 32 (5). Retrieved from:

McKee, J., & Brahm, N. (2016). Medical mimics: Differential diagnostic considerations for psychiatric symptoms. The mental health clinician, 6(6), 289–296.

Welch, K. A., & Carson, A. J. (2018). When psychiatric symptoms reflect medical conditions. Clinical medicine (London, England)18(1), 80–87.


Improving Diagnostic Accuracy: Medical Mimicry, Part 1

Anthony Smith, LMHC

Anthony Smith is a licensed mental health counselor in Massachusetts with 20 years of experience. He has worked in facilities and in private practice performing therapy and diagnostic evaluations across a wide array of populations both demographically and clinically. This includes 17 years in the forensic arena, where he currently provides assessments for the juvenile courts. Aside from interest in the intersection of psychology and law, Anthony is particularly in interested differential diagnosis and supervision of new practitioners. He regularly teaches abnormal psychology and creates courses on the lived experience of people with mental illness, along with supervising graduate student counselling practicums at a local university. When not providing clinical services, teaching or blogging, Anthony can be found hiking and fly-fishing around the Northeast and American West.


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APA Reference
Smith, A. (2020). Improving Diagnostic Accuracy: Medical Mimicry, Part 1. Psych Central. Retrieved on October 22, 2020, from