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

Brain Tumors

Affective disorders

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

Pharmaceutical drug (abuse or side effects)

PTSD

Seizures

⁉️sources from my experiences and internet research ⁉️

Grief (yes, sadly)

Hallucinogen use

Alcohol

Infection

Sleep disorders

Alzheimer's disease,

Alcohol withdrawal

Stress

Migraines

Head injury

Withdrawal from benzodiazepines

Bipolar disorder

Delirium tremens

Mental disorder

Charles Bonnet syndrome

Narcolepsy

Fever

Parkinson's disease

Dementia with Lewy bodies

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

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