psychotic disorder depression true https://www.epilepsy.com/living-epilepsy/healthy-living/emotional-health/overview-depression symptoms Depression (major depressive disorder) is a common and serious medical illness that negatively affects how you feel, the way you think and how you act. Fortunately, it is also treatable. Depression causes feelings of sadness and/or a loss of interest in activities once enjoyed. It can lead to a variety of emotional and physical problems and can decrease a person’s ability to function at work and at home. http://www.case.edu/EpSO.owl#Depression SYMP:0000022