Schizophrenia is a mental illness that changes how you think, feel, and act. Its symptoms vary from patient to patient and there is no strict set of symptoms that will affect everyone. Symptoms can come and go and change in severity over time.
Modern medicine distinguishes between the positive symptoms, such as hallucinations and delusions, which represent new ways that the sufferer has of thinking or doing things that they didn’t have when they were well. Negative symptoms, such as withdrawal, apathy or depression, represent ways in which the sufferer has stopped doing things that they used to do before they became affected. Positive symptoms are the ones that are the major indications of the condition since the negative ones can also indicate other conditions such as depression and anxiety.