I know that Graves Disease can have symptoms that mimic psychiatric disorders (anxiety, psychosis, mania, irritability, etc...). What other physical illnesses have symptoms that mimic psychiatric illnesses? In other words, if someone suddenly begins to behave quite differently than they have in the past what ailments/illnesses/conditions/diseases should they be checked for to ensure that they have not been misdiagnosed with a psychiatric problem they do not have?
This isn't a casual question, but I don't want to get into the specifics because it would take to long.
Thanks!
Melody