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Sexual dysfunction

Depression is a common reason for loss of desire and erectile dysfunction (ED), and it's one symptom that men are inclined not to report. "Performance problems can come from depression and make depression worse," Dr. Cook says.

However, ED can be the result of other medical conditions or medications (including antidepressants), and ED by itself does not signal depression.

"My strong recommendation...is that you can't go after one symptom; it's a group of symptoms," Klapow says.

Next: Indecision