Which mental disorder can cause a person to have hallucinations?
Sacks wrote a fascinating book on Hallucinations called....'Hallucinations'. One might also consider 'Charles Bonnet Syndrome' as a cause for hallucination in those going blind. For instance, in patients with Glaucoma, there have been instances where seniors in nursing homes have thought to be suffering from dementia when in fact they had Charles Bonnet Syndrome.
The types of hallucinatory experiences vary with simple geometric patterns all the way to seeing forms such as people.
The disorder is named after a Swiss naturalist who noticed the disorder in his grandfather after suffering from cataracts in both eyes.
For more example of hallucinations see: Oliver Sacks and his brilliant book 'Hallucinations'.
Further info for this book: https://www.goodreads.com/book/show/13330771-hallucinations
There’s a good number of them but schizophrenia and bipolar disorder are two really common ones.
Schizophrenia, schizoaffective disorder, major depressive disorder, and bipolar disorder are probably the most common for hallucinations. Mood disorders like major depressive disorder and bipolar disorder can have a specifier of "with psychotic features" which often include hallucinations.
what is schizoaffective disorder? What is its difference from schizophrenia?
Schizophrenia is the popular one but there are some others too like Borderline personality disorder
sleep related diseases and,etc.
Schziophrenia is an obvious one but I do not know the others.