Schizophrenia
Schizophrenia is one of the most persistent and disabling mental illness that an individual can suffer from. It is generally accepted that a certain defect in brain- chemical or structural, or both- causes a predisposition to Schizophrenia, which may then be brought on by external causes such as stress or emotional upheaval.
The illness is not inherited but rather the tendancy to get it can inherit. Scientist generally agree that Schizophrenia is a group of conditions rather than one simple disease. A cure for it is to be discovered. Although a cure has not yet been found, it may be successfully treated.

Signs of schizophrenia :
Hearing or seeing something that isn’t there
A constant feeling of being watched
Peculiar or nonsensical way of speaking or writing
Strange body positioning
Feeling indifferent to very important situations
Deterioration of academic or work performance
A change in personal hygiene and appearance
A change in personality
Increasing withdrawal from social situations
Irrational, angry or fearful response to loved ones
Inability to sleep or concentrate
Inappropriate or bizarre behavior
Extreme preoccupation with religion or the occult


Positive symptoms are capabilities that are "added" to the person's personality :
Delusions: False ideas - individuals may believe that someone is spying on him or her, or that they are someone famous.
Hallucinations : Seeing, feeling, tasting, hearing or smelling something that doesn’t really exist. The most common experience is hearing imaginary voices that give commands or comments to the individual.
Disordered thinking and speech : Moving from one topic to another, in a nonsensical fashion. Individuals may make up their own words or sounds.

Negative symptoms are capabilities that are “lost” from the person’s personality :
Social withdrawal
Extreme apathy
Lack of drive or initiative
Emotional unresponsiveness

Types of Schizophrenia :
Paranoid Schizophrenia : A person feels extremely suspicious, persecuted, or grandiose, or experiences a combination of these emotions.
Disorganized Schizophrenia : A person is often incoherent in speech and thought, but may not have delusions.
Catatonic Schizophrenia : A person is withdrawn, mute, negative and often assumes very unusual body positions.
Residual Schizophrenia : A person is no longer experiencing delusions or hallucinations, but has no motivation or interest in life.
Schizoaffective disorder : A person has symptoms of both schizophrenia and a major mood disorder such as depression.