The early symptoms of depression are sometimes hard to detect. At first they can appear as little more than a lack of energy or motivation and mood may simply appear like an off-day, to which we're all entitled. However, if these days become more regular it can be a sign that a depressive episode is on its way.

There is sufficient evidence pointing to the fact that giving into the early signs of depression can result in a longer and more severe depressive episode. Some early interventions...