## Most Common Positive Symptom in Schizophrenia **Key Point:** Auditory hallucinations are the most frequent positive symptom in schizophrenia, occurring in 60–80% of patients with psychotic episodes. ### Prevalence of Hallucinations by Modality | Hallucination Type | Frequency in Schizophrenia | Clinical Characteristics | |---|---|---| | **Auditory** | 60–80% | Most common; often voices commenting or conversing | | **Visual** | 20–40% | Less common; may occur with substance use or organic causes | | **Tactile** | 5–15% | Rare in primary schizophrenia; suggests organic pathology | | **Olfactory** | <5% | Uncommon; may indicate temporal lobe involvement | ### Characteristics of Auditory Hallucinations in Schizophrenia **High-Yield:** Auditory hallucinations in schizophrenia typically manifest as: - **Second-person voices** (addressing the patient directly) - **Third-person voices** (discussing the patient; pathognomonic) - **Command hallucinations** (instructing the patient to perform actions) - **Running commentary** (narrating the patient's actions) **Clinical Pearl:** The presence of third-person voices or running commentary is highly suggestive of schizophrenia and is included in Schneider's first-rank symptoms, which have high specificity for the diagnosis. **Warning:** Visual hallucinations are more common in organic psychoses (delirium, substance intoxication, neurological disorders) and should prompt investigation for medical causes before attributing them solely to schizophrenia.
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