Teenagers' sleep patterns may be a clue to their risk of depression. iStockphoto hide caption

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Girls are particularly vulnerable to brain changes caused by stress or trauma, researchers say. Allen Johnson/iStockphoto.com hide caption

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Childhood Maltreatment Can Leave Scars In The Brain
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Older men may have guns in the home that can pose a risk when people are depressed or not thinking clearly. iStockphoto.com hide caption

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Depression is common among old people, affecting up to 25 percent. iStockphoto.com hide caption

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Depression May Increase The Risk Of Dementia Later On
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Having a special someone won't fend off depression if that person doesn't have your back. iStockphoto.com hide caption

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Meredith Was, a senior at the University of Virginia, heads a chapter of the mental health advocacy group Active Minds. Jenny Gold for NPR hide caption

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Triage System Helps Colleges Treat Mentally Ill Students
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Did eating binges come first? iStockphoto.com hide caption

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Among common health problems, depression was linked to the highest increase in annual spending by employers' on workers' health care. iStockphoto.com hide caption

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A rat neuron before (top) and after (bottom) ketamine treatment. The increased number of orange nodes are restored connections in the rat's brain. Ronald Duman/Yale University hide caption

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Ketamine Relieves Depression By Restoring Brain Connections
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