Feeling depressed is very hard to explain to someone who hasn’t experienced it. It is not simply just being sad.
There may be a lot of other feelings that go along with it. Sometimes a common theme can be lack of action. For those who are really suffering, a basic action like brushing your teeth can feel insurmountable. When combined with other unhealthy, negative or addictive behaviours that come with depression, the symptoms can be magnified and it can quickly become a downward spiral.