Polymyalgia rheumatica (PMR) is a condition that occurs in women more than men, who are usually in their 70s. The condition involves muscle discomfort, soreness, and stiffness in the neck, shoulders, upper arms, hips, and upper thighs. The cause of PMR is unknown but it’s sometimes related to a viral illness that may cause the immune system to increase inflammation. There are some people who’ll have temporal arteritis and also develop symptoms of PMR, and how and why the two conditions overlap is unknown. Both conditions respond to oral steroids. It is estimated that roughly 711,000 people have PMR and 228,000 have temporal arteritis.