Can certain diseases cause paranoia similar to that seen in...

Parkinson's disease

Affective disorders

Charles Bonnet syndrome

Withdrawal from benzodiazepines

Seizures

Sleep disorders

Pharmaceutical drug (abuse or side effects)

Alcohol

Dementia with Lewy bodies

Migraines

Hallucinogen use

Grief (yes, sadly)

Mental disorder

Some of those things on the list are very very rare cases but I just wanted to cover everything (or almost everything).

Bipolar disorder

Narcolepsy

⁉️sources from my experiences and internet research ⁉️

Head injury

Alcohol withdrawal

Delirium tremens

Dementia and drug use cause paranoia. That is very common. Some of other things that can include delusions and/or hallucination can be:

Infection

Brain Tumors

Fever

Alzheimer's disease,

Stress

PTSD

Can certain diseases cause paranoia similar to that seen in individuals with paranoid schizophrenia, even if they do not have the disorder?