Rarely: Hives are rarely if ever caused by laundry detergent although may get a contact or irritant dermatitis from it. I often caution people about using fabric softener or anti-static strips which tend to increase the itching. For most cases of hives, oral antihistamine up to 4 doses per day would be the first choice. ...Read more.
Polymyalgia rheumatica is closely related to giant cell arteritis, another inflammatory disorder. Giant cell arteritis is characterized by progressive inflammation of many arteries of the body.
Additionally, some autoimmune diseases, such as lupus, have similar symptoms. Because fibromyalgia was once believed to be an arthritis-related condition, and many types of arthritis, such as rheumatoid arthritis, are autoimmune diseases, the assumption was that fibromyalgia fit into this category. Research, though, has pointed in different directions.