Depression is a jargon term with a specific meaning, as well as an everyday word with a fuzzy less specific meaning. That causes some confusion in discussions like this.
Depression covers a range of different illnesses, with different severities.
Depression is not a normal reaction to a life event.
When someone dies you feel grief. That grief may be severe. But grief is a normal reaction to death. If, however, the grief is overwhelming and lasts for years, and interferes with your life then it has developed into depression. Depression is an abnormal reaction to life events.
There is a form of depression termed "reactive depression". Something happens, and a person doesn't have a normal negative reaction but has an abnormal extreme negative reaction and falls into depression. The main treatment for that would be to correct the thing that caused the reaction, with some CBT, and medication if needed.
Depression covers a range of different illnesses, with different severities.
Depression is not a normal reaction to a life event.
When someone dies you feel grief. That grief may be severe. But grief is a normal reaction to death. If, however, the grief is overwhelming and lasts for years, and interferes with your life then it has developed into depression. Depression is an abnormal reaction to life events.
There is a form of depression termed "reactive depression". Something happens, and a person doesn't have a normal negative reaction but has an abnormal extreme negative reaction and falls into depression. The main treatment for that would be to correct the thing that caused the reaction, with some CBT, and medication if needed.