The significance of the appearance of a 'hanging man" in an uptrend is by the nature of its pattern that some form of selling pressure has emerged. The problem is the emergence of selling pressure may simply be profit taking before buying emerges to continue the trend and so reversal becomes continuation.
While my charts are set to candle sticks format I am not a fan of candle stick patterns. Trading is about integrating many skills and tools into some coherent manner that delivers an edge that we may end up with positive expectation over many trades. The problem with "hanging man" et al in candlestick is that they are merely just random pieces of many moving parts. Applying them without understanding context is a very narrow pathway with limited utility. Unfortunately for most traders learning about this business, knowledge is acquired in pieces. It can take years to understand how to integrate the pieces into some coherent trade plan.
The most basic understanding to acquire in trading is to understand trends. How they begin, how they end, how they enter consolidation, and how they come out of consolidation. Identifying a "hanging man" without understanding those basic ideas will invariably lead to your original question.