It is a mood disorder that causes a persistent feeling of sadness, a loss of pleasure and interest in usual activities, and a lack of concentration. It may be accompanied by feelings of guilt, worthlessness and low self-esteem. The condition affects emotions, thinking and behaviour, causing many emotional and physical problems, which in turn affect the ability to carry out daily activities. It can lead to a sense of hopelessness about life, thoughts of suicide, and, in advanced cases, may even result in suicide. Its prevalence is higher amongst older people due to various factors, so do not hesitate to visit a psychologist to help you overcome depression.