Depression :/ understanding ???

Depression affects a person's thoughts, outlook, and behaviour and mood they can also feel tired, irritable, with changes in appetite.

Depression can cloud everything.

The world looks bleak and the person's thoughts reflect that hopelessness and helplessness.

People with depression tend to have negative and self-critical thoughts. Despite their true value, people with depression can feel worthless and unlovable.

Significant weight loss or gain along with significant change in sleep patterns (inability to fall asleep, stay asleep, or get up in the morning)

Feelings of guilt or worthlessness aches and pains (with no known medical cause) pessimism and indifference (not caring about anything in the present or future) thoughts of death or suicide

Depressed mood or sadness most of the time (for what may seem like no reason) lack of energy and feeling tired all the time inability to enjoy things that used to bring pleasure .

Withdrawal from friends and family irritability, anger, or anxiety inability to concentrate

A feeling of having lost yourself, of not participating, a ghost like feeling.

Few people understand why some one suffering gets angry over a trivial matter. All normal sense of things are out of proportion the smallest unnoticeable thing is a huge issue to someone with depression and its a reason those not suffering can not understand.
Its more than sadness or low mood.
If you dont suffer please be patient, an exercise to help understand will to be of your worst most fearful moment and imagine it being even worse than you can think and thats what normal everyday things are like for a depressive person.