- Paranoid schizophrenia is the most common type worldwide, characterized by stable delusions like paranoia, often accompanied by auditory hallucinations and perceptual disturbances. Symptoms like disturbed affect, volition, speech and catatonia are not prominent. - Common delusions include persecution, reference, exalted birth, special mission, bodily change or jealousy. Auditory hallucinations may threaten the patient or command them, or be non-verbal noises. Other rare hallucinations can involve smell, taste, or bodily sensations. Visual hallucinations can also occur but are not predominant.