One of the most confusing things about schizophrenia is the language clinicians use. "Positive symptoms" sound like a good thing. "Negative symptoms" sound like a bad thing. In fact, both are challenging — they're just opposite in how they affect a person's experience.
Positive symptoms are experiences added to a person's normal functioning (hallucinations, delusions). Negative symptoms are aspects of normal functioning that are reduced or absent (motivation, emotional expression).
Positive symptoms in detail
Hallucinations
A hallucination is a sensory experience that has no external source. The most common in schizophrenia are auditory hallucinations — usually voices, sometimes commenting on the person, sometimes commanding them to do things. About 70% of people with schizophrenia experience them. Visual, tactile (touch), olfactory (smell), and gustatory (taste) hallucinations also occur but are less common.
Delusions
A delusion is a strongly held belief that isn't shared by the person's culture and that resists evidence. Common types include:
- Persecutory — belief that one is being followed, plotted against, or surveilled.
- Referential — belief that ordinary events (a song on the radio, a stranger's glance) carry secret personal meaning.
- Grandiose — belief that one has special powers, identity, or mission.
- Religious — beliefs about being chosen by God, possessed, or in direct communication with the divine.
- Somatic — beliefs about one's body that aren't medically supported (e.g., that organs are rotting).
- Thought-related — that thoughts are being inserted, withdrawn, or broadcast.
Disorganised thinking and speech
Speech that jumps from topic to topic, derails into unrelated tangents, or in extreme cases becomes incoherent ("word salad"). The underlying problem is in how thoughts are organised, not in the person's intelligence.
Disorganised behaviour
Difficulty completing tasks, unpredictable agitation, or in rare cases catatonic behaviour (extreme immobility or repetitive movements).
Negative symptoms in detail
Negative symptoms are often the most disabling part of schizophrenia and the hardest to treat with medication. They include:
Avolition
Reduced ability to initiate and persist in goal-directed activity. The person isn't lazy — they may genuinely be unable to push themselves out of bed in the morning, even when they want to. This is often misread as depression by family members.
Anhedonia
Reduced ability to experience pleasure. Activities that used to feel rewarding (favourite music, friends, hobbies) feel flat. Importantly, recent research shows that people with schizophrenia can often still enjoy activities in the moment (consummatory pleasure) but struggle to anticipate future enjoyment (anticipatory pleasure), which makes them less likely to start activities in the first place.
Asociality
Reduced interest in social interaction. Not the same as social anxiety — the desire to be with others is genuinely reduced rather than wanted-but-feared.
Alogia
Reduced quantity of speech. The person speaks in short answers, doesn't elaborate, and may take a long time to respond to questions.
Affective flattening
Reduced emotional expression — flat facial expression, monotone voice, fewer gestures. This doesn't mean the person isn't feeling emotion; their inner experience may still be vivid. It's the outward expression that's reduced.
Why the distinction matters
Positive symptoms tend to dominate the early years of schizophrenia and are what usually trigger a first hospitalisation. They also respond well to antipsychotic medication.
Negative symptoms often emerge earlier (sometimes during the prodrome) and persist longer. They respond poorly to most antipsychotics, contribute heavily to disability, and are now the focus of intensive new drug research. Therapies that help include CBT for psychosis, supported employment, and behavioural activation.
Cognitive symptoms — the often-forgotten third category
Beyond positive and negative, there is also a third group: cognitive symptoms. These include difficulty with attention, working memory, and executive function. Cognitive symptoms strongly predict day-to-day functioning and are now thought to be central to the condition.
What this means for treatment
A treatment plan should address all three symptom domains, not just whichever happens to be loudest at the moment. The most successful long-term plans typically include:
- An antipsychotic (primarily for positive symptoms)
- Psychotherapy or skills training (for negative and cognitive symptoms)
- Lifestyle support — sleep, exercise, social structure
- Family and peer support
This article is for educational purposes only and is not medical advice, diagnosis, or treatment. Always consult a qualified mental health professional. If you or someone you know is in crisis, call or text 988 in the US, or your local emergency number.