Migraine: This is a common condition that can cause blurry vision and headache, especially in women. The symptoms can be debilitating, but it is usually not life-threatening.

Tension Headache: This is another common type of headache that can cause blurry vision due to muscle tension and stress.
Dry Eye Syndrome: This condition can cause blurry vision and eye discomfort, which may be accompanied by a headache.
Sinusitis: Inflammation of the sinuses can cause headaches and blurry vision due to the pressure and congestion.

Giant Cell Arteritis: This is a serious condition that can cause sudden blindness if not treated promptly. It is more common in older adults, but it's essential to consider it in the differential diagnosis.
Pituitary Apoplexy: A rare but life-threatening condition that can cause sudden headache, blurry vision, and other symptoms due to a hemorrhage or infarction of the pituitary gland.
Subarachnoid Hemorrhage: A bleeding in the space surrounding the brain can cause a severe headache and blurry vision, and it requires immediate medical attention.
Idiopathic Intracranial Hypertension: A condition characterized by increased pressure in the brain, which can cause headaches, blurry vision, and other symptoms.

Optic Neuritis: An inflammation of the optic nerve that can cause blurry vision, pain, and other symptoms.
Brain Tumor: A rare but possible cause of blurry vision and headache, especially if the tumor is pressing on the optic nerve or other surrounding structures.
Multiple Sclerosis: A chronic condition that can cause a range of symptoms, including blurry vision, headaches, and other neurological problems.
Vestibular Migraine: A type of migraine that can cause blurry vision, headaches, and vertigo.