Does depression necessarily mean to be sad and feeling fatigue all the time or it could be lack of interest in anything in life even though you are not sad nor feeling fatigue all the time?

I can't find a good source to quote right this minute, but yes, sometimes depression can show up as apathy. Sometimes it shows up as irritability.

[pegasus]

Everything you ever wanted to know about depression here >>>> Depression Symptoms, Information & Treatment - Psych Central

[Leonithas]

Originally Posted by Le.Monsieur.S

Does depression necessarily mean to be sad and feeling fatigue all the time or it could be lack of interest in anything in life even though you are not sad nor feeling fatigue all the time?

Hi Andreas here. I'm a firm believer in carrying on as best you can. I've held down jobs for example even though I've been alone without someone to talk not for days but weeks at times. I had serious depression that lasted for years so it's not easy to put on a brave face. You have to be a good actor is what I mean and hide your depression from certain people. I hope this answers your question and others you might have. Thanks for reading this

[Tauren]

Yes, definitely.
My symptom was being angry all the time.

[gayleggg]

When I'm in a depressive mood I lose interest in everything. It's one of the many symptoms I have.

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[Slowbrains]

When depressed i'm mean, angry, cynical, slow, isolating myself, can't make decisions, don't remember anything, i have no motivation and don't see anything positive anywhere.

I can get out of bed and do my daily routines because otherwise i would be yelling to myself what kind of loser i am. and i'm bored listening that...

[Rebound]

Originally Posted by gayleggg

When I'm in a depressive mood I lose interest in everything. It's one of the many symptoms I have.

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Yes, same here, very common. I'm in a depressed state right now and it's mostly characterized by this kind of listless disinterest.