Normally, it is a common assumption that when someone gets sad or disappointed, people consider it as depression. But basically the standard of depression is quite aloft than getting sad or disappointed.
The definition of depression gets changed person to person, as it is entirely depended upon individual. The symptoms of depression are a part of life’s normal lows, but people having more symptoms gets mild form of depression and it lasts very long.
But at the time when these symptoms get overwhelming at that time it needs proper medication or need to have help of a doctor.