Why do i have sinus pain in the back of my head?

You don't!: If you fire up your computer and call forth a picture of the various sinuses in your body you can see that they are located at the front half of your skull. The maxillary sinuses are behind your cheek bones. The frontal ones are above your eyes, the ethmoidals are above nose and the sphenoid is deep inside the nose below the pituitary. You will notice none at the back of head!!