Based on the  WPI and SS score cut-points, the remaining 42% exhibited subclinical symptoms. Pain and emotional symptom trajectories, on the other hand, displayed a variety of longitudinal patterns. The study concluded that while most patients fibromyalgia symptoms endure, the severity of their pain tends to reduce over time.Baseline depressive symptoms in adolescents appear to predict worse pain at follow-up periods. Epidemiology
Fibromyalgia is estimated to affect 2–4% of the population.Females are affected about twice as often as males based on criteria as of 2014. History
Chronic widespread pain had already been described in the literature in the 19th century but the term fibromyalgia was not used until 1976 when Dr P.K. Hench used it to describe these symptoms. Many names, including "muscular rheumatism", "fibrositis", "psychogenic rheumatism", and "neurasthenia" were applied historically to symptoms resembling those of fibromyalgia. The term fibromyalgia was coined by researcher Mohammed Yunus as a synonym for fibrositis and was first used in a scientific publication in 1981. Fibromyalgia is from the Latin fibra (fiber) and the Greek words myo (muscle) and algos (pain).Historical perspectives on the development of the fibromyalgia concept note the "central importance" of a 1977 paper by Smythe and Moldofsky on fibrositis. The first clinical, controlled study of the characteristics of fibromyalgia syndrome was published in 1981, providing support for symptom associations.
Heat cramps, a type of heat illness, are muscle spasms that result from loss of large amount of salt and water through exercise. Heat cramps are associated with cramping in the abdomen, arms and calves. This can be caused by inadequate consumption of fluids or electrolytes. Heavy sweating causes heat cramps, especially when the water is replaced without also replacing salt or potassium.Although heat cramps can be quite painful, they usually dont result in permanent damage, though they can be a symptom of heat stroke or heat exhaustion. Heat cramps can indicate a more severe problem in someone with heart disease or if they last for longer than an hour.In order to prevent them, one may drink electrolyte solutions such as sports drinks during exercise or strenuous work or eat potassium-rich foods like bananas and apples. When heat cramps occur, the affected person should avoid strenuous work and exercise for several hours to allow for recovery. See also
Dehydration

References
External links
Heat cramps first aid