The Dow Jones fell 0.6% to 34,459.01.
The Nasdaq dropped 0.7% to 14,565.15.
The yield on a 10-year Treasury slumped 2% to 1.295%.
The price of gold decreased 0.2% to $1,798.10.
The price for a barrel of oil increased 0.8% to $72.79.
Orange County healthcare firms were trending down in Thursday midday trading, led by San Clemente-based Glaukos Corp. (NYSE: GKOS), which fell 5.9% to $76.30 a share for a $3.5 billion market cap.