You need to know the clinical symptoms of depression. On the top of this page click Health Information, go down to depression, then click the Information button and then down to Considerations. The list of symptoms is there.
Hi.....if you are sad and don't know why, have trouble getting out of bed...wanting to sleep a lot...no desire to go out with friends and family, or do the things that you once enjoyed....chances are you're depressed. But only a doctor can say for sure so if you feel like you are....please get help because you don't have to feel this way.