Diagnosis

To diagnose your condition, your doctor will conduct a physical examination and check for signs of hemifacial spasm. To determine the cause of your condition and develop the most appropriate treatment for your condition, imaging tests may be necessary.

Magnetic resonance imaging (MRI) uses a magnetic field and radio waves to create detailed images of your head and determine the cause of your hemifacial spasm. Your doctor may inject a contrast dye into a blood vessel (magnetic resonance angiogram) to look for any abnormal blood vessel that may be irritating the facial nerve.

You won't always need an MRI scan or other imaging test to diagnose hemifacial spasm. Your doctor may be able to diagnose the condition based on your symptoms and an exam. You may need an imaging test if your symptoms aren't typical or if you're preparing to have surgery.