1. If the individual parts of the compound subject are joined by and, always use a plural verb. 2. If the individual parts of the compound subject are joined by or or nor, use the verb form (singular or plural) which will agree with the subject closer to the verb.
Headaches in the back of the head may be caused by a variety of ailments and injuries. Chronic headaches in the back of the head -- also known as occipital headaches -- are often variants of tension-type headaches or migraines. New-onset occipital headaches are a more urgent concern. Possible causes include blood vessel abnormalities, nerve disorders and serious traumatic injuries.
Sometimes the pain is diffuse and felt throughout the head. At other times the pain in a headache can be localized to one specific spot or region of the head. A forehead headache or forehead pain is one such case. It is among the more common locations for pain in a headache, along with the temples and back of the head.