Symptoms first appear in late adolescence and early adulthood, normally between the ages of 16 and 25 for males and 25 to 30 for females.
They include: lack of drive or initiative, social withdrawal, apathy, emotional unresponsiveness, delusions, hallucinations, disorganized thinking and agitation.
Research has shown that schizophrenia is a biologically based brain disease. Studies show that two brain chemicals -- dopamine and serotonin -- are out of balance in those who suffer from the illness. Dopamine is responsible for emotions and motivation, and serotonin acts as a messenger and stimulates muscle movement.
Sources: Mentalwellness.com and Valley Counseling