It is estimated that up to 40 percent of people worldwide experience at least one severe headache each year. A headache is an ache or pain that can occur in the head, face, mouth, or neck when certain pain-sensitive nerves are stimulated by things such as stress or muscular tension.
There are several types of headaches and they can vary in the type of pain, the location of the pain, and the frequency of the pain, among other things. Not all headaches require medical attention. In fact, most headaches are easily treated. However, you should notify your healthcare provider if you have things such as a sudden, severe headache or headaches following a blow to the head.