The symptoms of schizophrenia vary from person to person and in the same person over time, and they do not always include visual hallucinations, Mental Health America says. The most common type of hallucination in schizophrenia is auditory, often in the form of voices giving commands or comments. Schizophrenia can also cause many symptoms besides hallucinations, including changes to personality, beliefs and behavior.
Other possible symptoms of schizophrenia include a constant feeling of being watched, strange posture, poor work performance, withdrawal from social situations and sleep difficulties, says Mental Health America. Nonsensical communication, indifference toward serious situations, poor hygiene, irrational responses to loved ones and an obsession with the supernatural are also common signs.
These signs and symptoms can be grouped into different types of schizophrenia, states Mental Health America. A person with disorganized schizophrenia has incoherent thoughts and speech but often doesn't suffer from delusions. A person with paranoid schizophrenia, however, suffers from delusions of grandiosity or persecution and is often very suspicious of others. Catatonic schizophrenia causes lack of speech, withdrawal and the tendency to rest in bizarre positions. Residual schizophrenia occurs after all hallucinations and delusions have ceased, but the person shows no interest in life and is completely unmotivated to action.