Not too long ago, I lived in Yuma, AZ then I moved to Flagstaff. The gal I was dating in Yuma would dive up for the weekend or I would drive down to see her. For about a year she had a low grade fever an none of the doctor in Yuma could find out the problem and just gave her antibiotics. Of course after they wore off, the fever was back.
One time she came up to see me and her fever got worse and her blood pressure went through the roof. After three days in the hospital and exploratory surgery, the doctor found NOTHING. Sent her home with antibiotics. The next month she had a her yearly dentist appointment. Guess what? She needed a root canal. Fever gone. Hospital stay for three days $60,000 + other charges.
Bizarre! And the only symptoms were fever and blood pressure?? Good to know (because I have Irish teeth, if you know what I mean.)