Depression is a common mental disorder. According to the Diagnostic and Statistical Manual, Fourth Edition (DSM-IV), the average age of onset is the mid-20s. Also, it is diagnosed more often in females than males.
Withdrawal
Depressed individuals tend to withdraw from engaging in activities. They might lose interest in doing things or avoid being around others.
Lack of Energy
Fatigue is a common symptom of depression. Even if depressed individuals express interest in doing something, they may not have the energy to participate.
Changes in Appetite
Over-eating and reduced eating are both signs of depression. Some depressed individuals may find that eating more makes them feel better. Yet, others may find that they have no appetite at all.
Changes in Sleeping
Sleeping often or for longer periods of time than usual is typical among people who are depressed. Difficulty falling asleep or staying asleep can also be symptomatic of depression.
Sadness
Feeling down or low for a significant period of time is characteristic of depression. Feelings of sadness and hopelessness often accompany a negative mood.
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