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.
This is especially true with migraine headaches. Head pain can be classified as being one of three types: 1) primary headache, 2) secondary headache, and 3) cranial neuralgias, facial pain, and other headaches. Common primary headaches include tension, migraine, and cluster headaches. Home remedies for tension headaches, the most common type of primary headache, include rest and over-the-counter (OTC) medications for pain. Secondary headaches are usually a symptom of an injury or an underlying illness.
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.