Selena Gomez has undergone a number of tests for blood pressure issues since being hospitalized Thursday ... TMZ has learned.
As TMZ first reported, Gomez was rushed to the hospital on Thursday after taping an appearance on "The Tonight Show," complaining of nausea and a severe headache.
Sources tell us Gomez has undergone a number of tests for blood pressure issues, but so far ... doctors have not been able to determine what is causing the problem.
Oh ... as for the rumors going around she's pregnant ... totally untrue.
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