People sometimes say “I’m depressed” when they mean they are fed up about something. They usually quickly recover from these feelings. True, or clinical depression, refers to a condition where feelings of extreme sadness can last for a long time.

Depression is common; about 15% of people will suffer from major depression at some point in their lives, and women are twice as likely to experience it as men. At its most serious, it can increase the risk of suicide.

Depression can occur at any age and in any culture. Symptoms include low mood, feeling tired, lack of interest in life, feelings of worthlessness, irritability and suicidal thoughts.

Depression varies from person to person and can be caused by a combination of factors.

Treatments include anti-depressant medication and talking treatments like psychotherapy, counselling and cognitive behavioural therapy (CBT).