Hi Sir, 2 years back I had a second root canal treatment on 2 of my infected teeth (front 2 upper teeth). After few days, I started to have high blood pressure and sinusitis and post nasal drip which never goes away. One of my tooth still has mild pain while I eat, so my question is whether the high blood pressure and sinusitis be caused by a bad root canal or is it just a coincidence? I am just 25 years old and on blood pressure medication.