is a mental disorder marked by the loss of contact with reality. When a person's thinking, feeling, and behavior is abnormal, it interferes with his or her ability to function in everyday life. Delusions, hallucinations, and irregular thinking and emotions are produced. If these signs are present, he or she may have the mental illness called . About one hundred years ago, was first recognized as a mental disorder and researchers have been searching for a cure ever since. The cause of is still unknown today and scientists have concluded th ....