Answers by TheMediTary.Com - Last updated: 23-Jul-2023
Abdominal or stomach tenderness is a known side effect of doxycycline.
Renal side effects associated with tetracyclines have included a dose-related rise in BUN (blood urea nitrogen).
There is no other renal side effect noted, however if you feel pain then I would suggest that you discuss it with your doctor.
https://www.drugs.com/sfx/doxycycline-side-effects.html