Hello Thank you for trusting HCM Dear reaserchers says that a frequent runny or stuffy nose may be more than just a vulnerability to pollen, pet dander, or cold germs: It can also make men more susceptible to high blood pressure, suggests a new study. Also the drugs used for sinusitis like decongestent may cause high blood pressure. Repeated blowing may aggravate blood pressure. stress sleep obstruction due to blokage may raise blood pressure. I think I explained possible causes for blood pressure shooting in sinusitis patients if you have more questions feel free to ask. Take care