Depression is a type of mental diseases. In this disease, the patient becomes hopeless and loose hearted.
This disease can be hereditary. Well, this disease is of two types- external and internal depression. External depression occurs due to any type of accident, mental injury or fast reaction while internal depression occurs by viral infection like glandular fever.
Depression is a mental disease. In this disease, if the patient is to be much vexed or sad, he should go to an expert psychologist.