Unfortunately, depression is not always diagnosed, because many of the symptoms mimic physical malaise, such as sleep and appetite disturbances. Recognizing depression is the first step in treating it. The symptoms of depression may vary from person to person, and also depend on the severity of the depression. Depression causes changes in thinking, feeling, behavior, and physical well-being. Changes in Thinking - You may experience difficulty with concentration and decision making.
Some people report problems with short term memory.
Negative thoughts and thinking are characteristic of depression. Some people have self-destructive thoughts during a more serious depression. Many people report feeling sad for no reason. Others report that they no longer enjoy activities that they once found pleasureable. You might lack motivation, becoming more apathetic.