Polymyalgia rheumatica (PMR) typically manifests as inflammatory pain in the shoulder and/or pelvic girdles in a patient over 50 years of age. This condition was long underrecognized and therefore underdiagnosed. Today, however, overdiagnosis may occur. Physicians must be aware that many conditions may simulate PMR, including diseases that carry a grim prognosis or require urgent treatment. PMR may be the first manifestation of giant cell arteritis, and a painstaking search for other signs is mandatory. PMR may inaugurate other rheumatologic diseases such as rheumatoid arthritis, RS3PE syndrome, spondyloarthropathy, systemic lupus erythematosus (SLE), myopathy, vasculitis, and chondrocalcinosis. Finally, PMR may be the first manifestation of an endocrine disorder, a malignancy, or an infection. Failure to respond to glucocorticoid therapy should suggest giant cell arteritis, malignant disease, or infection. Ultrasonography may assist in the diagnosis by showing bilateral subdeltoid bursitis. Glucocorticoids are the mainstay of the treatment of PMR. Although the optimal starting dosage and tapering schedule are not agreed on, a low starting dosage and slow tapering may decrease the relapse rate. Methotrexate is probably useful when glucocorticoid dependency develops. In contrast, TNF- antagonists are probably ineffective.