Everyone occasionally feels sad or blue. Brief feelings of sadness, upset or discouragement are a normal part of life, especially after disappointments or losses. However, when the feelings of sadness become overwhelming, last for more than a couple of weeks and interfere with a person's ability to function then the person may be suffering from the disorder called depression.
Information in this section is provided by Rhode Island Hospital psychiatrist Mark Zimmerman, MD. The psychiatry department's services include the MIDAS Project, an ongoing clinical research study involving the integration of research assessment methods into routine clinical practice