4. Headaches
Most of the pain caused by fibromyalgia is seen as a primary symptom. In the language of the doctors, a primary symptom is seen as a direct result of the condition that is causing it, while a secondary symptom is the indirect result of the condition in question; in other words, it is a symptom that is derived from another symptom.
Even if most of the pain reported in fibromyalgia is considered a primary symptom, experts believe that the headaches that often affect patients are actually a secondary symptom caused by how other muscles are affected. Headaches in fibromyalgia can be of the migraine type or the tension headache type. They are often the result of excessive tension in the muscles of the neck or even the upper back. Since all muscles are connected with each other through connective tissue (hence the name), tense neck muscles can pull head muscles and cause pain.