There are five major subtypes of Schizophrenia, each classified by their most prominent symptom:
 

Paranoid Schizophrenia Disorganized Schizophrenia Catatonic Schizophrenia Undifferentiated schizophrenia Residual schizophrenia

a) Paranoid Schizophrenia

The defining feature of paranoid Schizophrenia is absurd or suspicious ideas and beliefs. These ideas typically revolve around a coherent, organized theme or “story” that remains consistent over time. Delusions of persecution are the most frequent theme; however delusions of grandeur are also common.
People with paranoid Schizophrenia show a history of increasing paranoia and difficulties in their relationships. They tend to function better than individuals with other schizophrenic subtypes. In contrast, their thinking and behavior is less disordered and their long-term prognosis is better.
 

do not show grossly disorganized speech or behaviour very resistant to arguments against their delusions typically tense, suspicious, guarded, sometimes hostile or aggressive (violence and suicide) onset usually at a later age than the other types

b) Disorganized Schizophrenia

Disorganized Schizophrenia generally appears at an earlier age than other types of Schizophrenia. Its onset is gradual, rather than abrupt, with the person gradually retreating into his or her fantasies.

The distinguishing characteristics of this subtype are disorganized speech, disorganized behavior, and blunted or inappropriate emotions. People with disorganized Schizophrenia also have trouble taking care of themselves, and may be unable to perform simple tasks such as bathing or feeding themselves.
The symptoms of disorganized Schizophrenia include:

 

Impaired communication skills Incomprehensible or illogical speech Inappropriate reactions (e.g. laughing at a funeral) Emotional indifference Infantile behavior (baby talk, giggling) Peculiar facial expressions and mannerisms

People with disorganized Schizophrenia sometimes suffer from hallucinations and delusions, but unlike the paranoid subtype, their fantasies aren’t consistent or organized.

c) Catatonic Schizophrenia

The hallmark of catatonic Schizophrenia is a disturbance in movement: either a decrease in motor activity, reflecting a stuporous state, or an increase in motor activity, reflecting an excitedstate.

Stuporous motor signs. The stuporous state reflects a dramatic reduction in activity. The person often ceases all voluntary movement and speech, and may be extremely resistant to any change in his or her position, even to the point of holding an awkward, uncomfortable position for hours.

Excited motor signs. Sometimes, people with catatonic Schizophrenia pass suddenly from a state of stupor to a state of extreme excitement. During this frenzied episode, they may shout, talk rapidly, pace back and forth, or act out in violence—either toward themselves or others.
People with catatonic Schizophrenia can be highly suggestible. They may automatically obey commands, imitate the actions of others, or mimic what others say.

d) Undifferentiated schizophrenia:

Patients are clearly schizophrenic, but cannot be fitted into one of the above types.

e) Residual schizophrenia:

- continuing presence of schizophrenic disturbance in the absence of a complete set of active symptoms or of sufficient symptoms to meet the criteria
- e.g.Flat affect, social withdrawal, eccentric behaviour, illogical thinking, mild loosening of associations.
- no prominent delusions or hallucinations