A 55-year-old female patient presents to the neurology clinic with sudden, severe, electric shock-like facial pain on the right side. The pain is localised to the distribution of the trigeminal nerve and lasts for a few seconds to a few minutes. It is triggered by simple activities such as eating, talking, or even a light touch. The patient describes the pain as excruciating and debilitating. The neurologist considers a diagnosis of trigeminal neuralgia.