Everyone feels sad or low at certain points in their life. Depression is when these feelings of sadness, hopelessness and negative become a consistent and dominating factor in a persons life. It is often said that if you are experiencing these negative emotions consistently over a period of two weeks and they are having a significant impact on your ability to function in every day life than you should seek medical advice. http://www.depression-anxiety-stress-test.org/ provides further information as well as a free online test for depression, anxiety and stress.
Sadness is a cause of a certain effect that will go away once the person heals, chronic depression has no cause, the person is depressed for no reason and it's not easy to heal.
The difference between disappointment and sadness...Hmm... Sadness is something you feel yourself. Disappointment is when you feel unhappy with a decison someone has made.
Guilt and sadness
Some quotes from The Bean Trees by Barbara Kingsolver include these: "There is no point treating a depressed person as though she were just feeling sad, saying, 'There now, hang on, you'll get over it.' Sadness is more or less like a head cold- with patience, it passes. Depression is like cancer."
Depression
Depression sadness
Sadness.
depression
depression
Depression.
Depression is the feeling of how a person feels with and extreme length of sadness.
What is the difference between smiling and frowning?