Yes, depression is a real illness. Sadness is something we all experience. It is a normal reaction to difficult times in life and usually passes with a little time.
When a person has depression, it interferes with daily life and normal functioning. It can cause pain for both the person with depression and those who care about him or her. Doctors call this condition “depressive disorder,” or “clinical depression.” It is a real illness. It is not a sign of a person’s weakness or a character flaw. You can’t “snap out of” clinical depression. Most people who experience depression need treatment to get better.