<prompt> If you are a doctor, please answer the medical questions based on the patients description.My husband has been actively completely out of character over the past week and has been paranoid, anxious and delusional. It was so sudden that I asked for health checks including a brain scan which was refused. I cannot leave him alone and now I m waiting for a psychiatric referral. Now for the fourth time in two days he has complained of a burnt toast smell. I ve just searched this and it suggests a brain injury. Is this true?  <response>: There are few things which I may clarify:Delusional disorders are those in which person has delusions pertaining to only one life sphere. Rest of the behavior is normal. Delusion as a symptom can occur in many disorders like schizophrenia, depression, bipolar disorder and some others. But each of these disorders are accompanied by some other features. Burnt toast smell can be a feature of some central nervous system pathology, so can be the delusion. So I would advise you to go for a brain scan MRI. Treatment will depend on the MRI findings. 