Back pain that lasts more than three months (chronic) is less common than acute pain. Back pain often develops without a specific cause that your doctor can identify with a test or imaging study. Muscle or ligament strain. Repeated heavy lifting or a sudden awkward movement may strain back muscles and spinal ligaments.
Visit your doctor.: Sinus pain can be very significant, significant enough to raise your blood pressure. You should visit your doctor to make sure that your headaches are really just from sinus pressure, and not from something more serious.
Rating Newest Oldest. Best Answer: Sinus infections can cause you to have an upset stomach, just as you said from post nasal drip and also maybe the antibiotic that you are taking. Sinus infections could also cause you to have headaches and can lead to eye infections, and ear infections, etc.