Depressive disorders are characterized by sadness severe enough or persistent enough to interfere with function and often by decreased interest or pleasure in activities. Even though the exact cause is not known but probably involves heredity, changes in neurotransmitter levels, altered neuroendocrine function, and psychosocial factors. Diagnosis is based on history.
To understand this more better following are the symptoms:
• Persistent sad, anxious, or “empty” mood
• Feelings of hopelessness, or pessimism
• Feelings of guilt, worthlessness, or helplessness
• Loss of interest or pleasure in hobbies and activities
• Decreased energy or fatigue
• Moving or talking more slowly
•Feeling restless or having trouble sitting still
• Difficulty concentrating, remembering, or making decisions
• Appetite and/or weight changes
• Thoughts of death or suicide, or suicide attempts
• Aches or pains, headaches, cramps, or digestive problems without a clear physical cause and/or that do not ease even with treatment.
Please understand, not everyone who is depressed experiences every symptom. Some people experience only a few symptoms while others may experience many.