The distinctive signs and symptoms of neurasthenia are capable of fairly precise definition, and there need rarely be any doubt, or difference of opinion, as to whether a particular case is to be classed as of this nature or not. The chief symptoms are a constant feeling of fatigue, not relieved by rest, and the occurrence of various forms of hyperæsthesia, paræsthesia, and localised pain. Two important physical signs constantly occur—exaggeration of the patellar reflex and tremor of the eyelids when the eyes are half closed. Added to these, there are, in greater or less degree, characteristic mental features which constitute the picture of psychasthenia, namely, incoercible ideas, obsessions, and monophobias.
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