As many have stated already, clinical depression is a physical disorder of the brain due to a chemical imbalance. Everyone will experience some sort of depression in life since it is one of the 5 stages of grief, but clinical depression is beyond a normal sadness when grieving. People suffering from depression may experience the following symptoms: unusual sadness, feeling of hopelessness, negative views toward self, significant change in appetite (eat too much or too little), significant change is sleep patters (oversleeping or insomnia), decreased interest in sex, lack of interest in activities that normally are enjoyed, and in moderate to severe cases irrational and/or illogical thinking, which may lead to suicidal thoughts. In essence, people suffering from depression are noticeably different in how they look, act, and interact with others. The more severe the depression, the more difficult it is to treat.
Studies have shown that in mild to moderate depression (depression we may all experience at some point) counseling alone was more effective than medication alone; however, the best way to treat moderate to severe depression is a combination of counseling and medication. Sometimes the depression can be so severe that electric shock treatment may be necessary to supplement the medication. If you or someone you know may be experiencing some of the depressive symptoms, it is best to meet with a counselor earlier than later. Often times if people treat it with counseling early, they can prevent themselves from the downward spiral of getting worse. Unfortunately, there are some people that are genetically disposed to really struggle with the disease since their brain is more susceptible to not function properly. Healthy diet and exercise makes a big difference in keeping the brain healthy, which is why all counselors and doctors have that (or at least they should) in their treatment plans. Also how intentional we are in the way we think influences brain function which is why counseling is so effective.