Clinical depression is having a low mood, sadness or emotional numbness for an extended period of time. Feeling down or ‘blue’ from time to time is a normal experience in life, however if it isn’t resolved in a reasonable time, it could be clinical depression. Depression usually happens due to a combination of difficulties over time, rather than one event or issue. Recent events can result in depression, however, if you’re at risk due to previous problems or personal factors, you are more likely to experience it. There are different types of depression and it helps to know which one you are dealing with.