Can a mri of the brain show if a person is depressed , anxious, my dr. checking for cancer an m.s. ?

MRIs: Are good for detecting structural/anatomical abnormalities. They don't detect emotional or psychiatric abnormalities. The exception would be if you had a structural abnormality, like a tumor effecting the "emotional" centers in your brain.

MRI: An MRI brain may reveal structural or vascular abnormalities, tumors or demyelinating diseases, like multiple sclerosis. Depression or anxiety disorders are diagnosed differently and the MRI will have no diagnostic value.

Kafka!!: Did you see the movie"Kafka"starring Jeremy Irons?There's a scene of them dissecting a brain looking for the soul.Looking at YOU as a unique,whole individual with unique past,unique hopes, dreams,thoughts,etc will reveal more than a generic MRI looking for generic problems most probably already apparent clinically. The MRI will rule out generic problems,a functional MRI is better,but not ideal

Not normally: The type of MRI that may be able show functional changes in the brain associated with mood disorders or anxiety disorder isn't routinely ordered except mostly for research purpose, so-called functional MRI. Otherwise, the MRI's routine order demonstrate really only anatomic changes/lesions that you might see with a stroke, bleed, MS, etc.