There is a mental patient at home, but she doesn't think she is sick and refuses to be examined. What should I do?

Generally speaking, it is really not a wise choice to say that people are mentally ill, whether with good intentions or malicious intentions.

What you have to do is take him to the hospital. Then, one of the ways to detect mental illness should have topics such as choices that he needs to fill in. So the relatively safe way to recommend a few to you:

Go to the doctor yourself, explain his condition, and ask the doctor to send you a document for testing. After you download and print it, go home and give it to him and say, come on, help me fill this out, be careful! Find any excuse, as long as it is logical.

Take it to the hospital by force (not recommended)

It is more suitable for doctors to come to the house, but the cost is high.