Is someone with dementia hallucinating, seeing people that aren't there, talking to them, hiding things normal? Is that a stage of dementia?

Hallucinations are in fact common in some dementias. I think you need a clear diagnosis if you are able to get it of what sort of dementia you are dealing with, then do some real search-machine research. My bro had Lewy's Dementia, early stages, before his death. His hallucinations were very unique to Lewy's, and different from the typical Parkinson's hallucination (when they occur). I would say that any case is about as unique to the person as another illness. Meaning that the same persons, diagnosed with breast cancer, say, have very different courses of illness and outcome. So you are dealing with a unique dementia in a unique person. Makes it not an easy thing!Get as much information as you are able.

You don't provide much information, but, yes, hallucinations may occur with someone exhibiting dementia symptoms. However, there are many causes of hallucinations besides dementia. Your first step is with your doctor to determine the cause of the hallucinations and eliminate or treat any treatable conditions. It may be something as treatable as a UTI or vitamin B deficiency. Has this person been told by a doctor after a cognitive evaluation that he/she has dementia? If so, you need to find the cause of the dementia. Dementia in itself is not a diagnosis nor is it a disease. It is a term that refers to symptoms and the inability to perform certain daily tasks. Please follow up with your doctor to get a definitive explanation.

Yes, it could be the dementia. But hallucinations are very common with UTI's. Time for a check.