Actually, there are a lot of things other than dementia that can cause symptoms like agitation, hallucinations, and delusions.
Certain medications can cause these symptoms.
Certain medical conditions can cause them, too, such as narcolepsy and other sleep disorders, and mental conditions such as schizophrenia. Even common conditions like urinary tract infections can cause these symptoms.
Grief or emotional trauma can cause symptoms. Even excessive exercise has been known to spark symptoms.
If your loved one abuses drugs or alcohol or is going through recovery, you might see these symptoms.
Covid-19 can cause symptoms such as olfactory hallucinations (smelling things that aren’t there.)