hmm?

how do you know that you have depression?

[remar]

What symptoms are you having? The more info we have the better we can help and answer your question. Many of us that have depression might only have a couple of minor symptoms where others have many severe symptoms.

[sjcfootball]

There are many levels of depression.  One may have depressive symptoms or clinical depression.  The symptoms can range from irritability, feeling sad, over or under eating/sleeping, lack of energy, no motivation, feelings of hopelessness/worthlessness.  The main focus is on the duration, severity, and how if affects you.  If these symptoms persist for longer periods and significantly interfere with your life (avoiding friends, missing work, poor performance, not doing what you like) you may want to seek help from a doctor and/or therapist.  

[4Maddie44]

Perhaps the article below about signs of depression may help you.  You can also answer questions on a depression site on internet that may give you the answer.  I advise you to see a doctor if you have some of the symptoms.