It may also occur as a consequence of a chronic illness or chronic pain, or as a side effect of medication. There are a variety of signs of depression, and the change in behavior may be subtle or dramatic. Sleep disturbances are common, and while some people sleep more than usual, others are unable to sleep. Depression may cause one to stop eating or to overeat. You may cry easily, or even all the time.
Some people notice an inability to concentrate or to make decisions.
Others feel restless or listless. Another sign is alcohol or drug abuse. Generally, there is a lack of interest in activities that previously were enjoyable. If you are depressed, there are some ways to try to help yourself. Get regular exercise at least three times a week.