Psychology February 21, 2026 3 min read

What is the Cause of Mental Illness?: The Truth Behind Modern Diagnoses

O
Oiyo Contributor

Introduction: Is the Diagnosis Your Identity?

Depression, anxiety disorders, bipolar disorder, schizophrenia… When visiting psychiatry, we are given one or more ‘diagnoses.’ And those diagnoses sometimes become a label that defines us. However, Dr. Christopher Palmer raises an important question: “Do these numerous diagnoses we use really mean distinct ‘separate diseases’?”

Today, I want to talk about the blind spots of the diagnostic system of modern psychiatry and the fundamental cause that pierces through all mental illnesses.


1. Current Diagnostic System: Just a List of Symptoms

The diagnostic criteria (DSM-5) currently used in psychiatry are thoroughly focused on ‘symptoms.’ For example, if you feel low, have no appetite, and cannot sleep for two weeks, you are diagnosed with ‘depression.’ The important point here is that it doesn’t ask ‘why’ those symptoms occurred.

It’s similar to giving a diagnosis of ‘high fever’ to a person who has a fever. But a fever can occur because of a cold, it can occur because of cancer, or it can occur because of inflammation. The causes are all different, but the reality now is focusing only on the phenomenon of ‘fever’ revealed on the outside.

2. Mental Illnesses with Vague Boundaries

In fact, it is very common in clinical fields for symptoms of several mental illnesses to overlap. Depression patients also see hallucinations, and schizophrenia patients also experience extreme depression. Also, the diagnosis given to a patient sometimes changes over time.

What does this mean? It’s highly likely that diseases we believed were separate are actually different branches spreading out from one common root. It’s like if the root of a tree rots, some branches dry their leaves and some branches don’t bear fruit.

3. Genetics, Environment, and Factors Beyond That

Of course, environmental factors such as genetic factors, childhood trauma, and extreme stress greatly affect mental illness. However, even if they experience the same stress, some get sick and some are fine. Even with same genes, only one may develop the disease.

Existing medicine tried to explain this with the ‘Biopsychosocial Model,’ but this model only threw too many variables and failed to present a clear operating mechanism. Dr. Palmer points to Metabolic Problems at the Cellular Level as the decisive link that will weave all these puzzle pieces into one.


Conclusion: Real Treatment Starts Only When You Know the Cause

Suppressing symptoms may be the beginning of treatment, but it cannot be the end. We must understand why we are sick and why the switches of our brains are malfunctioning to finally enter the path of ‘recovery’ rather than ‘management.’

The investigation into the truth hidden behind your diagnosis—how your body’s energy system broke down and how it can be fixed—begins now.

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