F20-F29: Schizophrenia, schizotypal and delusional disorders

F23: Acute and transient psychotic disorders

Acute and transient psychotic disorders are a group of conditions characterized by sudden and temporary periods of disturbed thought, perception, and behavior. These conditions usually develop rapidly, often within two weeks and frequently appear in response to a significant life stress or traumatic event. Symptoms may include confusion, disorientation, hallucinations (seeing or hearing things that are not real), delusions (false beliefs), and significant changes in behavior. These disorders affect the brain and central nervous system, causing an acute onset of symptoms. The severity and duration of the symptoms can vary widely, from hours to months, but they typically resolve within one month. The affected individuals often return to their previous level of functioning after the episode, although they may be at risk for recurrence in periods of stress.