Inherited factors also play a role in the probability that an individual will develop PMR. Several theories have included viral stimulation of the immune system in genetically susceptible individuals.Infectious diseases may be a contributing factor. This would be expected with sudden onset of symptoms, for example. In addition, new cases often appear in cycles in the general population, implying a viral connection. Studies are inconclusive, but several somewhat common viruses were identified as possible triggers for PMR. The viruses thought to be involved include the adenovirus, which causes respiratory infections; the human parvovirus B19, an infection that affects children; and the human parainfluenza virus. Some patients attribute the onset of PMR to stress.Persons having the HLA-DR4 type of human leucocyte antigen appear to have a higher risk of PMR. Diagnosis
No specific test exists to diagnose polymyalgia rheumatica; many other diseases can cause inflammation and pain in muscles, but a few tests can help narrow down the cause of the pain. Limitation in shoulder motion, or swelling of the joints in the wrists or hands, are noted by the doctor. A patients answers to questions, a general physical exam, and the results of tests can help a doctor determine the cause of pain and stiffness.One blood test usually performed is the erythrocyte sedimentation rate (ESR) which measures how fast the patients red blood cells settle in a test tube. The slower the red blood cells settle, the higher the ESR value (measured in mm/hour), which means inflammation is present.
Rheumatoid neutrophilic dermatitis (also known as "Rheumatoid neutrophilic dermatosis") is a cutaneous condition associated with rheumatoid arthritis. See also
Sweets syndrome-like dermatosis
List of cutaneous conditions


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