Gist:
Psychosis is a syndrome, i.e. a group of symptoms that can be caused by different psychiatric disorders
What looks like odd behaviour is actually a breakdown:
- no control over mind
- loss of touch with reality
- normal thought process has shut down
- abnormal beliefs like people are trying to harm him, fear of people
- abnormal perceptions like seeing and hearing things that others around don’t
Possible causes
- Schizophrenia
- Mania
- Severe depression
- Some personality disorders
Treatment
This is an emergency as he may hurt himself or others.
Necessary to go to a hospital for immediate sedation and investigation of the cause
Complete article:
http://www.dnaindia.com/health/comment_psychosis-between-15-and-25-be-a-little-more-careful_1676639
drshyamalavatsa 
This article needs a wide audience as it simplifies and demystifies a very complex and “taboo” topic. Knowledge is power, especially in the case of mental illness.
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I agree. I’m hoping Aamir Khan will take it up on ‘Satyameve Jayate’ 🙂 Though, I must confess, I’ve only seen one episode, the one on Childhood Sexual Abuse, and that was quite good, despite the melodrama.
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