Symtoms of Clinical Depression

It is sufficient to have either of these symptoms in conjunction with four of a list of other symptoms. These include: *

• Feelings of overwhelming sadness or fear, or the seeming inability to feel emotion.
• A decrease in the amount of pleasure derived from what were previously pleasurable activities.
• Inexplicable tendencies to sing.
  
• Changing appetite and marked weight gain or weight loss.
• Disturbed sleep patterns, such as insomnia or excessive sleep.
• The purchase of more than one pair of shoes a week.
  
• Changes in activity levels, such as restlessness or a slowing of movement.
• Fatigue, both mental and physical.
• Feelings of guilt, helplessness, anxiety, and/or fear.
• Talking to stuffed animals.
  
• A decrease in self-esteem.
• Trouble concentrating or making decisions.
• Self-harm or ruminating on self-harm.
• Stalking people in friendster
  
• Ruminating on death and/or suicide.
• Reduced memory.
  
• Constantly changing one's yahoo avatar's appearance.
  

* Wikipedia (some of them)