A long shadow is one that is at least as long as the body, and indicates extreme sentiment.Long shadows are reversal indicators.A long upper shadow means that the high is well above the open and the close: in an uptrend, this is a failure to close near the high, and may indicate weakening near a resistance level in a downtrend, this means that some people were buying at much higher prices, and again the trend may be over if the long upper shadow follows a doji, it is more significant A long lower shadow means that the low was well below the open and the close: in a downtrend, this is a failure to close near the low, which may indicate weakening near a resistance level in an uptrend, this means that there was some buying at lower levels, which again indicates weakness