Polymyalgia rheumatica (PMR) is an inflammatory condition that causes severe pain and stiffness in the shoulders, hips, and neck, typically striking people over 50. It develops relatively quickly, often over days to weeks, and the hallmark symptom is morning stiffness lasting longer than 45 minutes. PMR is not a muscle disease despite its name; the inflammation targets the tissues surrounding joints, particularly the bursae and synovial linings of the shoulders and hips.
Who Gets PMR
PMR overwhelmingly affects older adults. The average age at diagnosis is 74, and it rarely appears before age 50. Women develop it roughly twice as often as men, and incidence peaks in the 70 to 79 age group before declining after 80. The condition is most common in people of Northern European descent, though it can occur in any population.
What It Feels Like
The pain typically hits both sides of the body at once. About 81% of people have bilateral shoulder pain at diagnosis, and 59% have pain in both hips. But PMR often reaches beyond those two classic areas. Nearly 45% of people report knee pain, about 27% have hand pain, and more than half experience what researchers classify as widespread pain across multiple body regions.
The stiffness is often the most disabling part. It is worst in the morning or after sitting still for a long time, and it can make basic movements like getting out of bed, raising your arms overhead, or climbing stairs genuinely difficult. Many people also experience fatigue, low appetite, mild fever, and unintentional weight loss alongside the musculoskeletal symptoms.
What Drives the Inflammation
PMR is driven by an overproduction of a specific inflammatory signaling molecule called interleukin-6 (IL-6). Blood levels of IL-6 are consistently elevated in people with PMR and track closely with symptom severity. When levels go up, symptoms worsen; when they drop, people feel better. Steroids suppress IL-6 production rapidly, which explains why PMR responds so dramatically to treatment. However, steroids don’t fix the underlying mechanism that triggers the excess IL-6 in the first place. Studies show that even after months of steroid therapy, withdrawing the medication causes IL-6 levels to spike right back up, which is why relapses are so common.
How PMR Is Diagnosed
There is no single blood test or imaging scan that confirms PMR. Diagnosis relies on a combination of clinical features and lab work. The core criteria include being 50 or older, having bilateral shoulder pain not explained by another condition, morning stiffness lasting more than 45 minutes, and elevated blood markers of inflammation. The two key markers are erythrocyte sedimentation rate (ESR), typically above 40 mm/h, and C-reactive protein (CRP), typically above 6 mg/L.
A critical part of diagnosis is ruling out conditions that mimic PMR, particularly late-onset rheumatoid arthritis (RA). The two can look remarkably similar in older adults. The key difference is that RA usually involves specific autoantibodies, including rheumatoid factor (RF) and anti-CCP antibodies, while PMR does not. RF is positive in roughly 67% of elderly-onset RA patients but only about 7% of those with PMR. Another distinguishing clue: PMR responds dramatically to low-dose steroids, while RA typically requires higher doses and additional medications.
The Connection to Giant Cell Arteritis
About 10% of people with PMR also develop a related condition called giant cell arteritis (GCA), which involves inflammation of large blood vessels, especially the arteries running along the temples and scalp. The symptoms to watch for are new, severe headaches (usually concentrated at the temples), scalp tenderness, and jaw pain while chewing. If the arteries supplying the eyes become inflamed, vision problems can follow, ranging from brief episodes of blurriness to permanent vision loss.
GCA is considered a medical emergency because of the risk to eyesight. If you have PMR and develop sudden headaches, jaw pain, or any visual changes, that combination needs urgent evaluation. GCA requires much higher steroid doses than PMR alone.
Treatment and What to Expect
PMR responds remarkably well to corticosteroids, specifically prednisone. Guidelines recommend starting at 15 to 20 mg daily, though some evidence suggests that a dose adjusted to body weight (roughly 0.2 mg per kilogram) may be sufficient for many people, with nearly 80% of patients in one study responding well to a starting dose below 15 mg. The response is often dramatic: most people experience at least a 75% improvement in symptoms within the first week.
Once symptoms are controlled and inflammation markers normalize, the dose is gradually tapered over many months. This is where PMR gets tricky. The relapse rate is high. About 43% of patients experience at least one relapse within the first year of treatment, usually during or shortly after a dose reduction. Each relapse means bumping the dose back up and starting the taper again. On average, people with normal inflammatory markers at relapse reach steroid-free remission in about 18 months, while those with persistently elevated markers may need closer to 23 months.
The prolonged steroid use creates its own challenges. Long-term prednisone can contribute to bone thinning, weight gain, elevated blood sugar, high blood pressure, and increased infection risk. For people who relapse repeatedly, additional medications that suppress the immune system through different pathways can reduce the number of future flares and shorten the time to remission.
How PMR Differs From Normal Aging Aches
Many people initially dismiss PMR symptoms as “just getting older,” and the distinction matters. Normal age-related stiffness tends to ease within a few minutes of moving around, affects one area more than others, and doesn’t come with blood markers of systemic inflammation. PMR stiffness lasts 45 minutes or more, affects both sides of the body symmetrically, and is accompanied by measurably elevated inflammatory proteins. The onset is also notably faster than typical degenerative joint changes. If bilateral shoulder and hip stiffness develops over a period of weeks rather than years, and mornings feel dramatically worse than the rest of the day, that pattern points toward PMR rather than wear-and-tear arthritis.