 [ Symptoms ] blood test for mononucleosis came back as negative but symptoms suggest otherwise my 13 year old daughter has had blood tests for mononucleosis which came back as negative however she is becoming more and more exhausted is pale achy has a sore throat and is sleeping a lot what else could this be [ Disease ] every woman is different so you will need to make that determination based on your body type there are no medical contraindications from wearing a sports bra all of the time but you will have to re evaluate your support needs as the years progress