Fatigue could just be a lack of sleep, but depression makes you less motivated and more apathetic.
"That is an excellent question! Yes, indeed fatigue is one of the primary symptoms of major depression, however, fatigue alone is not enough to make the diagnosis for major depression as there are many reasons that a person could be tired."
A casual link is a link of informal, or less than formal nature. Not to be confused with 'causal' link.
Depression sadness
Help.
One recent study concluded that depression was the result of CFS and was not its cause
It is an even. There need not be any causal link.
One recent study concluded that depression was the result of CFS and was not its cause
Psychological
It is known that pain in itself can actually cause depression. Fatigue from lack of sleep or the illness itself also contribute to depressed feelings.
The symptoms include: fatigue, depression, weight gain, hair loss, and bad moods. This is the reference link used: http://thyroid.about.com/cs/symptomsproblems/a/heartrisk.htm
Ritalin was first used in the 40's for issues like combat fatigue, depression and psyhosis.
Depression causes lack of motivation. Feeling sluggish and tired are a result. Depression can also cause sleep insomnia or make you over sleep.