The key is the combination of pharmacological therapy with psychological therapy to overcome the disorder. From the psychological perspective, depression is not a disease, this causes it to be considered a disorder when the person is sad too often, episodes of sadness are too serious and too long lasting. But it is not categorically different from a person without depression. For the medical and psychiatric model, it is.The key is the combination of pharmacological therapy with psychological therapy to overcome the disorder. From the psychological perspective, depression is not a disease, this causes it to be considered a disorder when the person is sad too often, episodes of sadness are too serious and too long lasting. But it is not categorically different from a person without depression. For the medical and psychiatric model, it is.