Depression affects a person's thoughts in such a way that the person doesn't see when a problem can be overcome. It's as if the depression puts a filter on the person's thinking that distorts things. That's why depressed people don't realize that suicide is a permanent solution to a temporary problem in the same way that other people do. A teen with depression may feel like there's no other way out of problems, no other escape from emotional pain, or no other way to communicate a desperate unhappiness.