Many people criticize psychiatric disorders for being vague and arbitrarily defined. I hear people say depression is just a matter of degree. They claim to have periods of sadness so why medicate people? They say that psychiatric illness is not like medical illness because they can’t get a simple blood test to prove its existence.
My response is to point out that the most common medical syndromes for which people take medications are just as arbitrarily defined. This includes, diabetes, hypertension and heart disease. Autopsies on soldiers reveal evidence for atherosclerotic disease in 20 year olds. What degree of vascular occlusion merits medical treatment? Should a stent be put in an artery that is 50%, 60%, 70%, 80% or 90% occluded? Does the patient have to be symptomatic to have a procedure done?
What is the glucose cut off for a diagnosis of diabetes? For treatment with medications? It used to be over 200. Now it is 120. As more evidence for future complications became evident, the optimal blood sugar levels began to get lower and lower and include patients who had no overt symptoms. The same is true of cholesterol levels. Millions of people take statin medications and have no symptoms other than a blood test out of a statistically defined range. Many of these people suffer severe side effects from the statins including muscle aches and depression.
But somehow more criticism is given to doctors prescribing antidepressants to people who are suffering severely from depression and anxiety. These symptoms greatly impair the patient including risk to loosing their jobs and relationships. Every psychiatric disorder list in the DSM (Diagnostic and Statistical Manual) includes a set of criteria that requires the symptoms to be severe enough to cause impairment in function and not be due to another condition including medical illness. This is not true of all medical illnesses for which medications are given. Patients are given a blood pressure medication for having a blood pressure reading above an arbitrary cut off. This cut off has been lowered over the years appropriately reflecting knowledge of risk factors. Still the criterion is just a number without any other symptom needing to be present.