Changes in the type of language people use to express themselves may be a warning sign of schizophrenia but changes in attention and memory proficiency are typically the first signs.
"Such impairments can increasingly restrict professional capacity and the ability to relate," says Peter Falkai of the German Society for Psychiatry and Psychotherapy, Psychosomatics and Nerve Medicine.
However, friends, families and colleagues often only first notice these symptoms during an acute outbreak of the disease.
The symptoms of schizophrenia often develop slowly over a long period. An altered perception of reality can be another warning sign.
For those affected, sounds and colours can seem more vivid or changed.
