<p>Your mojo's missing, you're moody as a teen, your biceps have lost bulk. It could be low testosterone, or low T. While so-called <a href="/health/mens-health/is-there-male-menopause">male menopause</a> (in which the <a href="/health/endocrine-system/testosterone">male hormone</a> takes a nosedive) affects a small percentage of men, virtually all males experience low T with age. <a href="/health/low-testosterone/what-causes-low-testosterone-levels">Other causes</a> range from illness and injury to stress and drinking. Learn <a href="/health/low-testosterone/effects-of-low-testosterone">how low testosterone affects health</a> and how you can deal with it.</p> <p><a href="/health/low-testosterone/article/telltale-signs-low-testosterone">Get the lowdown on low testosterone</a></p>
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Low Testosterone Q&As
How does low testosterone affect a man's concentration?
<p>Men with low testosterone often report poor concentration, says Steven Kaplan, MD, professor of urology at New York-Presbyterian Hospital/Weill Cornell Medical Center and director of the Iris Cantor Men's Health Center. Some studies have found a connection between cognitive function, memory, and testosterone (even a link between low testosterone and Alzheimer's disease), but that doesn't mean you'll become a crossword whiz or never lose your keys if you've got ample amounts of testosterone. Memory and testosterone both decrease with age. Scientists are still trying to figure out exactly how one influences the other.</p><p></p>