SHORT ANSWER
Psychosis is a state in which a person perceives reality differently: hearing voices, having fixed beliefs that others do not share, or sharply changing behaviour. It is a medical condition, not "weakness" and not "character"; early specialist help noticeably improves the prognosis.
Why is that?
What it looks like: hallucinations (most often auditory — voices), delusional beliefs (for example, that someone is being watched or persecuted), confusion and disorganisation of behaviour, sharp swings in activity. It is important to understand: for the person these experiences are real and frightening — arguing about their "non-existence" is useless and harmful.
Where it comes from: psychosis can arise in schizophrenia-spectrum disorders, severe depression or bipolar disorder, from psychoactive substances, severe sleep deprivation and some somatic illnesses. That means it is not a "curse" or "character", but a condition with specific causes that a doctor establishes during assessment.
Why early help matters so much: according to research, the shorter the period from psychosis onset to first treatment (duration of untreated psychosis), the better the long-term outcome — fewer episodes, higher chance of returning to study and work. Modern antipsychotics and family support allow most people to live a normal life.
WHAT TO DO
- Speak calmly and concretely: do not argue with the content of beliefs, respond to feelings ("I can see you are scared").
- Remove from the environment what intensifies the state (substances, chaos, sleep deprivation).
- If there is risk to self or others — urgent help; at first signs — specialist assessment as soon as possible.