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Women who are overweight or obese appear to have an increased risk of developing the chronic pain syndrome known as fibromyalgia, a new study suggests. If they are also sedentary, the risk is even greater, said lead researcher Paul Mork, of Norwegian University of Science and Technology in Trondheim, Norway. The study is published in the May issue of Arthritis  Care & Research . Fibromyalgia is marked by widespread pain lasting more than three months. The pain strikes so-called "tender points" in the neck, shoulders, back, hips, arms and legs. The condition is also marked by fatigue without apparent cause, mood disturbances, sleep problems and headaches. More women than men have it, and experts don't thoroughly understand its cause. The condition may be due to dysfunction in the nervous system and other problems, and it is thought to be affected by genetic susceptibility. In the new study, Mork and his colleagues turned to a data base of nearly 16,000 women in Norway

Definition of Tachycardia The heart normally beats at a rate of about 60 to 100 beats per minute at rest. A rate faster than 100 beats a minute in an adult is called  tachycardia . Most people experience transient rapid heartbeats, called sinus tachycardia, as a normal response to excitement,anxiety,stress , or exercise. If tachycardia occurs at rest or without a logical cause, however, it is considered abnormal. Description of Tachycardia The two main types of  tachycardia     are abnormal supraventricular tachycardias (which originate in the upper chambers of the heart, the atria) and ventricular tachycardias (which originate in the lower chambers of the heart, the ventricles). Causes and Risk Factors of Tachycardia Sinus tachycardias are most likely to occur in those who are easily excitable, suffer anxiety, or drink a lot of caffeine-containing beverages. They may also been seen in people with thyroid disease, with fevers, or with certain drugs (especially asthma and allergy me