Cluster Headache
Doctors do not know the exact cause of cluster headaches. Nonetheless, they have effective methods of treating cluster headaches [8]. This headache is characterized by severe and burning pain behind one eye or on a side of your face. It is common that the affected areas are swollen, red, nasal congestion, eye tearing, and sweating. It happens periodically in the victim, but in series when it happens. One headache (can last 15 minutes-3 hours) is followed by another. The patient may have up to four of these headaches in series for a day. As said walker, this can be followed by symptoms-free months when the patient doesn’t have cluster headache [9] attacks.