Headaches can range across the intensity spectrum from mild, tolerable pain to severe pain that prohibits daily activities. Headaches can be occasional, recurrent or chronic in frequency. With several different types of headaches, it can often be difficult to understand the underlying cause of the pain.
According to the International Classification of Headache Disorders (ICHD), there are four primary types of headaches. Secondary causes of headaches include head or neck trauma and injuries, stroke, intracranial hemorrhage, and vascular malformations.