What is causing frequent headaches behind my left eye and around my nose area?

Headache: Headaches that include one eye and the nose can sometimes be caused by sinus infections. This could also be a migraine or a cluster headache. However, one-sided headaches can sometimes be signs of more ominous things and should always be checked out by your doctor.

Multiple things: Altgough that could easily be sinusitis it can also be a neurologic headache. Cluster headaches are often one sided, in the eye area, last 1-2 hours, are associated with one sided nasal cogestion and tearing (although it's a bit more common in men) an evaluation by ENT (including a ct scan to confirm) will usually get you on the right track.