Headaches can be caused by a congested or plugged sinuses. If sinus pressure headaches occur you could try increasing the humidity to help alleviate congestion or try a full face mask to take some of the pressure off the nasal airway. Also, headaches can be a result of your pressure being too high. Please contact our office to discuss potential adjustments to correct this; we may be able to adjust your EPR/pressure relief setting to help.