1 in 5 people will experience depression at some point in their life. The symptoms of depression can range from mild to severe.
The physiological symptoms may include problems with sleep (trouble getting off to sleep, waking in the night), problems with appetite (increased or reduced appetite), reduced concentration affecting short term memory loss, loss of patience and enjoyment in activities.
This may lead people to start napping in the day, avoid activities they used to enjoy, avoid seeing friends and family and start isolating themselves.
This can then lead to negative thought patterns and severe levels of depression may lead people to think about suicide and feel that life is not worth living.