Another common problem I see in my daily practice is headache. Young and old alike present with this condition and sometimes, I get 'headache' as well in trying to figure out their headache. Let's learn together the nature of this common problem. This will be a series. Headache is defined as pain in the head that is located above the eyes or the ears, behind the head (occipital), or in the back of the upper neck. Headache, like chest pain or dizziness, has many causes. There are two types of headaches: primary headaches and secondary headaches. Primary headaches are not associated with (or caused by) other diseases. Examples of primary headaches are migraine headaches, tension headaches, and cluster headaches. Secondary headaches are caused by associated disease. The associated disease may be minor or serious and life threatening. Tension headaches are the most common type of primary headache; as many as 90% of adults have had or will have tension headach...