Stocks are sliding again after their worst day in several months

Stocks opened lower on Tuesday, putting the market on track for its weakest two-day performance in six months. 
This represents a pause from the recent rallies to all-time highs that some strategists have described as "parabolic." 
A decline in healthcare stocks, and concerns about rising Treasury yields, were among the drivers of the sell-off. The major US stock indexes opened lower on Tuesday following the market's weakest trading session so far of 2018. 
If Tuesday ends up