| ICD9 = |}}Neurasthenia was first used by George Miller Beard in 1869 to label a condition with symptoms of fatigue, anxiety, headache, impotence, neuralgia and depression.The term had been used at least as early as 1829 to label an actual mechanical weakness of the actual nerves, rather than the more metaphorical "nerves" referred to, by Beard, in 1869.Americans were supposed to be particularly prone to neurasthenia, which resulted in the nickname "Americanitis" (popularized by Willia