Khloe Kardashian Sees Doctor for Stress-Related Sickness

The reality star had to cancel a book signing today.

The reality star, 31, wrote on Twitter: "Dolls! So sorry I needed 2 re schedule my book signing. I'm sick & dr's orders are that I need to lay low until we narrow down what's wrong."

"Ill be going for more testing today. I'm very sorry again. Stress can run our bodies down so please everyone take care of yourselves," she said.

Kardashian has been on the talk show circuit, appearing on "The Ellen DeGeneres" show earlier this week.