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A sinus headache can be caused by an infection (bacterial or viral) or from allergies. Signs that you have a sinus infection include:

• A fever.
• Green or gray discharge from your nose that lasts more than 7 to 10 days.
• A runny or stuffy nose.
• A feeling of fullness in the ears, or plugged ears.
• Swelling or puffiness in the face.