From the correlation of news and bitcoin prices we can understand how various activities and news are affecting the price of this popular cryptocurrencies
Bitcoin can fall due to various reasons:
When there is some * regulatory issues* preventing a group of people from buying bitcoin
When other crypto currencies are replacing bitcoin for better peer to peer electronic currency transfer
When exchanges are getting less accessible
Spread of fear, uncertainty and doubt by the media that bitcoin prices will go down which will result in panic selling decreasing the value of bitcoin.
Internal issues within the bitcoin community can cause a decrease in value.
But remember if the fear gets to you, what if it rises the next. you do not wanna live in regret for selling out your precious bitcoins. Think about that, if you are OK with the possible skyrocketed bitcoin prices, its OK to sell.