Schizophrenia is having more than one personality, isn't it?
No. That's dissociative personality disorder you're talking about. Quite rare. Schizophrenia isn't nearly as rare. These are the symptoms;
Signs and symptoms of schizophrenia generally are divided into three categories — positive, negative and cognitive.
Positive symptoms
In schizophrenia, positive symptoms reflect an excess or distortion of normal functions. These active, abnormal symptoms may include:
Delusions. These beliefs are not based in reality and usually involve misinterpretation of perception or experience. They are the most common of schizophrenic symptoms.Hallucinations. These usually involve seeing or hearing things that don't exist, although hallucinations can be in any of the senses. Hearing voices is the most common hallucination among people with schizophrenia.Thought disorder. Difficulty speaking and organizing thoughts may result in stopping speech midsentence or putting together meaningless words, sometimes known as word salad.Disorganized behavior. This may show in a number of ways, ranging from childlike silliness to unpredictable agitation.Negative symptoms
Negative symptoms refer to a diminishment or absence of characteristics of normal function. They may appear with or without positive symptoms. They include:
Loss of interest in everyday activities
Appearing to lack emotion
Reduced ability to plan or carry out activities
Neglect of personal hygiene
Social withdrawal
Loss of motivation
Cognitive symptoms
Cognitive symptoms involve problems with thought processes. These symptoms may be the most disabling in schizophrenia because they interfere with the ability to perform routine daily tasks. A person with schizophrenia may be born with these symptoms. They include:
Problems with making sense of information
Difficulty paying attention
Memory problems
http://www.mayoclinic.com/health/schizophrenia/DS00196/DSECTION=symptoms