Toothache can cause headache, which is a typical symptom of pulpitis. The initial stage of tooth pain is simply pain from eating, or pain from hot or cold stimuli. As the disease progresses, nocturnal pain and pain that cannot be localized to a specific tooth in the upper or lower jaw may occur, and sometimes the headache may radiate to the auriculotemporal region. Headaches caused by pulpitis do not usually radiate to the opposite side, but are confined to the same side. In addition to headaches caused by pulpitis, they can also be caused by trigeminal neuralgia. Lesions in the branches innervated by the trigeminal nerve can have symptoms similar to those of a toothache. However, all trigeminal neuralgia will have a distinct trigger point, which may be a certain sensitive piece of skin, and if it is accidentally touched an electric shock-like pain will occur, which is a typical feature of trigeminal neuralgia.