Most people feel depressed at some stage of their lives, but for some the feelings are more intense and last longer. This type of depression doesn't just 'go away', and telling the person to 'cheer up' or 'pull yourself together' doesn't help. It's not that simple. But there is hope. Depression is a medical condition that can usually be treated. A doctor may prescribe medication or therapy - or a combination of the two.

The important point is to seek help.Symptoms to look out for:

Depressed mood - most of the day, every day
Mood swings - one minute high, next minute low
Lack of energy and loss of interest in life
Irritability and restlessness
Disturbed sleep patterns - sleeping too much or too little
Significant weight loss or gain
Feelings of worthlessness and guilt
Difficulty concentrating and thinking clearly
Loss of sex drive
Thoughts about death and the option of suicide

If someone you know suffers from depression that lingers:Encourage them to see a doctor or healthcare professional. Be there for them.