Treatment of migraine. Presumably migraine is associated with a genetic predisposition to hypersensitivity of neuro-vascular reactions. According to another hypothesis (vascular hypothesis) is caused by contraction of cerebral vessels and increased permeability of vascular walls leading to pain attack. 
The compounds contained in the secretions of the salivary glands act analgesic by removing stasis in blood vessels, dilate blood vessels (e.g. histamine), increase the level of endorphins (happy hormones). Effect of hirudosubstances on vascular system in human body is well known, because of that migraine, regardless of its etiology, is treated promptly and effectively.
Application hirudotherapy in JG4 point.
That acupuncture point has a very strong analgesic effect, so is used practically in all pain syndromes. The most important point for headaches.
