The word "headache" is a catch-all term, but there are actually more than 150 distinct headache disorders, each with unique symptoms and causes — including facial pain.
Primary Headaches
Primary headaches arise on their own without an obvious external cause. They often involve changes in brain chemistry and nerve cell activity. Migraines are a well-known example.
Secondary Headaches
Secondary headaches result from an underlying condition such as sinus problems, high blood pressure, or head trauma, which irritates or displaces pain-sensitive nerve endings. Trigeminal neuralgia — a nerve disorder — falls into this category.
How Headaches Produce Pain
Brain tissue itself has no pain-sensitive nerves. Instead, pain signals travel via the trigeminal nerve, which originates at the base of the brain and has three branches transmitting sensation from:
- The scalp
- Blood vessels inside and outside the skull
- The meninges
- The face, mouth, eyes, ears, and throat
When triggers activate pain-sensitive nerve endings, signals pass through the trigeminal nerve to the thalamus — the brain's central relay — which then routes them to areas that generate symptoms like nausea, vomiting, and difficulty concentrating.
Why Your Face May Hurt
In trigeminal neuralgia, even a light touch to the face can trigger severe pain. This occurs when pressure on the trigeminal nerve — often from a nearby blood vessel — causes it to malfunction. Contributing factors include aging, multiple sclerosis, brain lesions, or other conditions that compress the nerve.
Proper diagnosis is critical, as treatment options vary depending on the underlying cause of the headache or facial pain disorder.