We feel so bad for Selena Gomez! According to a report from TMZ, she has been in and out of the hospital undergoing a series of blood pressure tests after she was rushed to the hospital a few days ago.

The singer had been complaining of nausea and a severe headache before an appearance on 'The Tonight Show With Jay Leno' last week. She was rushed to a nearby hospital in Los Angeles and has been undergoing blood pressure tests to try and pinpoint the problem.

Although doctors do not know what's wrong with Ms. Gomez, we are just happy that she is feeling better than she was last week. Hopefully her boyfriend Justin Bieber will have bring her some chicken soup!

Even if Gomez was sick during her 'Tonight Show' interview, you never would have guessed it from her calm and cool composure. Feel better, Selena! We are keeping you in our thoughts.

Watch Selena Gomez's Interview on 'The Tonight Show With Jay Leno'