Depression

If the people who feel sad sometimes, they say they are depressed. But depression is not only just feeling sad it's a medical sickness. People who has "major" depression they had most of the symptoms such as
No attention or satisfaction in things you used to enjoy, including sex
Feeling sad or numb
Crying easily or for no reason
Feeling slowed down or feeling restless and irritable almost every day. There is as well a "minor" form of depression that causes not as much of severe symptoms. Both have the same causes and treatment.
Your body holds chemicals that assist manage your moods. If you not have enough of these chemicals or your brain doesn’t react to them properly, you may become depressed. Depression may be heritable. Abusing drugs or alcohol can also cause depression. Some medical troubles and medications may lead to depression.