The signs of depression vary largely between patients and can range from mild, unnoticeable sadness to severely disabling symptoms. Not all people experience all the depression symptoms discussed here; the symptoms vary from patient to patient and also differ in severity and duration. Additionally some people have these symptoms persisting for long periods whereas others may have repetitive, sporadic spells lasting for some time.
It must be borne in mind that depression not only affects the patient but also burdens his family and friends; it ultimately even affects the patient's quality of work.
Depression can present as a combination of any of the symptoms mentioned here and it significantly affects the normal functioning of the person: