Symptoms & Signs
Anger and Irritability: When the Threshold Drops
Anger and irritability arise from an imbalance between an over-reactive threat system and weakened top-down control, sharpened by frustration and low serotonergic restraint. Irritability is a quietly important symptom that predicts later mood disorders and can signal a mixed state that changes treatment.
7 min readAnhedonia: The Loss of Pleasure and Interest
Anhedonia is the reduced ability to feel pleasure or interest, most often a disturbance of the brain's dopamine-driven reward system rather than a simple absence of pleasure. It predicts worse outcomes, resists SSRIs, and is frequently the symptom left standing after treatment.
6 min readAppetite and Weight Change: A Symptom That Points Two Ways
Appetite change is a bidirectional symptom, and the direction it points matters: decreased appetite aligns with a stress-driven, melancholic biology, while increased appetite marks the inflammatory, immunometabolic subtype. It is also one of psychiatry's most consequential medication effects.
6 min readBrain Fog: Cognitive Symptoms and the Clouded Mind
Brain fog is a real, common, and disabling cluster of subjective cognitive difficulties — trouble with attention, speed, memory, and executive function — that arises across many conditions and shares much of its biology with fatigue. It drives disability and relapse and is frequently disbelieved.
6 min readFatigue: The Exhaustion That Outlasts Rest
Fatigue is brain-generated exhaustion that outlasts rest — most often a central rather than a muscular problem, shaped by inflammation's energy-conserving sickness response and the same effort-and-reward circuitry behind anhedonia. It is common, disabling, often residual, and too often dismissed.
6 min readMotivation, Avolition, and Apathy: When the Drive to Act Fails
A motivation deficit is the failure of the brain's drive to turn intention into action — most often a disturbance of the dopamine-based effort-and-reward system. It is routinely mistaken for laziness, is a leading cause of disability, and is often caused or worsened by medication.
7 min readSleeplessness: Insomnia and the Overactive Brain
Insomnia is the experience of being unable to sleep despite the chance to — best understood not as too little sleepiness but as too much wakefulness, an overactive arousal system maintained by stress, biology, and learned worry. It predicts and worsens depression and is eminently treatable.
7 min readSymptoms Over Syndromes: Why the Pieces Matter More Than the Label
Depression is lived as specific symptoms, not as a diagnostic label. Those symptoms cut across diagnoses, cluster by shared brain mechanisms, and are often more tractable treatment targets than the syndrome itself.