Depression: A (major depressive disorder or clinical depression) is a common but serious mood disorder. It causes severe symptoms that affect how an individual feels, thinks, and how they handle daily activities, i.e. sleeping, eating and working. To be diagnosed with depression, the symptoms must be present for at least two weeks.

Persistent sad, anxious, or โ€œemptyโ€ mood.
Feelings of hopelessness, pessimistic.
Feelings of guilt, worthlessness, or helplessness.
Loss of interest or pleasure in activities.
Decreased energy or fatigue.
Moving or talking slowly.
Feeling restless & having trouble sitting still.
Difficulty concentrating, remembering, or making decisions.
Difficulty sleeping, early-morning awakening & oversleeping.
Appetite & weight changes.
Thoughts of death or suicide & or suicide attempts.
Aches or pains, such as sciatica, headaches, cramps, or digestive problems without a physical cause that do not ease with treatment.

Not everyone who is depressed experiences every symptom. Some experience only a few symptoms while others experience several. Several symptoms in addition to low mood are required for a diagnosis of major depression. The severity and frequency of symptoms along with the duration will vary depending on the individual and their particular illness. Symptoms can also vary depending on the stage of the illness.