Headache
A headache can affect several areas of the head, including a network of nerves that extends over the scalp and certain nerves in the face, mouth, and throat. The sensation of pain can be 'referred', which means the irritation in one area can transmit the feeling of pain via associated nerves to another area. A good example is neck pain leading to headache. There are different types of headache and many different causes including stress and muscular tension, diet and food sensitivities, jaw problems, hormone problems, eye problems and ear, nose and throat problems.