bacterial infection
"Took Levaquin for lingering congestion & low-grade fever following a bout of influenza. Read about the side effects involving tendons, so was watchful during the 10 days I took it. Had no problems until the morning after the last dose when I woke up with all 10 fingers painfully locked in a curled position ("trigger finger"). Improved after a day or so, but I still have occasional trouble with one finger. "