Psychosis could be triggered by a number of things, such as: Physical illness or injury. You may see or hear things if you have a high fever, head injury, or lead or mercury poisoning. If you have Alzheimers disease or Parkinsons disease you may also experience hallucinations or delusions.

What can cause sudden psychosis?

The following medical conditions have been known to trigger psychotic episodes in some people:HIV and AIDS.malaria.syphilis.Alzheimers disease.Parkinsons disease.hypoglycaemia (an abnormally low level of glucose in the blood)lupus.multiple sclerosis.More items