The positive and negative symptoms of schizophrenia refer to the "good" and "bad" symptoms.

Positive Symptoms

In psychology, symptoms that add an unwanted behavior or feeling, such as hallucinations or delusions, especially noted in schizophrenia.

Negative Symptoms

Symptoms of some mental health disorders such as schizophrenia, which include the absence or reduction of normal functions, like diminished emotional expression or motivation.