What are the similarities and differences between
(uni-polar depression and bipolar depression)

Uni polar depression is low mood accompanied by low self-esteem, and by loss of interest or pleasure while Bipolar depression is A mental disorder that causes periods of depression and abnormally elevated moods.

Explanation:

chris is feeling fitt not fat

that information cannot be released except with patient permission or to immediate family members. you could state the patient is ok but you cannot give any information on the illness or on treatment being given.