Migraine: This is often characterized by headaches accompanied by visual disturbances such as blurry vision, photophobia, and sometimes aura. The combination of headache and blurry vision makes migraine a top consideration due to its prevalence and the nature of its symptoms.

Tension Headache: While typically not associated with blurry vision, severe tension headaches can lead to visual disturbances due to muscle tension affecting the eyes or due to stress-related responses.
Sinusitis: Inflammation of the sinuses can cause headaches and, if the sinuses around the eyes are affected, could potentially lead to blurry vision due to swelling or increased pressure.
Dry Eye Syndrome: This condition can cause eye discomfort, blurry vision, and sometimes headaches due to the strain on the eyes.

Giant Cell Arteritis: A condition that can cause headaches and visual disturbances, including blurry vision, due to inflammation of the arteries. It's crucial to diagnose early to prevent permanent vision loss.
Papilledema: Increased intracranial pressure can cause headaches and blurry vision due to the pressure on the optic disc. Conditions like brain tumors or idiopathic intracranial hypertension can lead to this.
Temporal Arteritis: Similar to giant cell arteritis, this condition involves inflammation of the arteries and can lead to severe visual disturbances and headaches.

Occipital Lobe Seizures: Rarely, seizures originating from the occipital lobe can cause visual disturbances, including blurry vision, and sometimes headaches.
Pituitary Apoplexy: A condition where there's sudden hemorrhage or infarction of the pituitary gland, leading to severe headache and potentially visual disturbances due to the proximity of the pituitary gland to the optic chiasm.
Idiopathic Intracranial Hypertension (IIH): Also known as pseudotumor cerebri, this condition involves increased pressure within the skull without any obvious cause, leading to symptoms like headache and blurry vision.