n. The verb in a verb phrase that expresses the action, state, or relation and is not an auxiliary verb. In the sentence, The bird has flown, fly is the main verb.
Types of Headache. This medical symptom information shows the various types of Headache, and other related symptoms or conditions, including their causes and diagnosis. Throbbing headache. Persistent headache. Severe headache. Migraine. Aura. Forehead pain.
Chronic daily headaches are, in turn, subdivided into two categories: 1  Short-duration headaches, or those lasting fewer than 4 hours. The most common short-acting chronic headaches are cluster headaches. 2  Long-duration headaches, which last more than 4 hours.