ATOPOS

Diagnosis as Compression: What a Label Leaves Out

2025-11-03 · Alun @Atopos
#Psychology#Self#BrainFog

“The doctor says I have moderate depression.”

“The doctor says I have an anxiety disorder.”

A name has been given. But does “What is this?” also answer another question: how did things become this way?

1. After the Story Is Compressed↗

When distress enters a medical record, part of a life becomes information that can be passed on. Shared features are retained; many details remain outside the page. The question is whether those omitted details will have a chance to return.

The language of machine learning makes this selection explicit in a simple information flow. Let hh denote a history, TT a recording process that loses information, xx the information retained, CC a classification process, and y^\hat y its output label:

h→Tx→Cy^,T(h1)=T(h2)⇏h1=h2.\begin{aligned} h&\xrightarrow{T}x\xrightarrow{C}\hat y,\\ T(h_1)=T(h_2)&\not\Rightarrow h_1=h_2. \end{aligned}

This is a sketch of recording and classification, not a clinical diagnostic algorithm. Different histories may leave the same record. Even a correct classification cannot, by itself, reconstruct how a person arrived there.

The same label need not mean the same path toward it.

Yet a compelling story is not automatically closer to the causes than a diagnostic name. Attributing every difficulty to a loss or a relationship can also bring an explanation to a premature end.

2. Diagnosis Is Not the Destination↗

Diagnosis itself requires further questions. NIMH's introduction to depression describes assessment of when symptoms began, how long they have lasted, how they affect daily life, and whether other medical conditions could cause similar symptoms. The presence of a diagnosis does not mean that the doctor has failed to see the person.

Compressing a story does not, by itself, establish that treatment has failed. Symptoms need to be recognized, and a person's circumstances need to be understood. Neither has to cancel the other.

The more useful questions come after the name. Does the conversation continue? Is there room for experiences that did not enter the code? Can the person's needs and preferences inform the choices that follow in care?

A label can help care continue. Treated as the whole answer, it can also obscure questions that remain unfinished.

Diagnosis is not the destination, but a starting point.

A name can make distress recognizable. It should not bring a person's story to an end.