Polymyalgia rheumatica (PMR) typically causes pain and stiffness in the muscles of the shoulders and the pelvis. It develops quite quickly over a week or so and is especially bad in the mornings.
If you have pain in both shoulders and you're feverish or feel generally unwell, you should seek medical advice at an early stage as polymyalgia rheumatica can have complications – for example, inflammation of the blood vessels in the head.
Polymyalgia rheumatica responds well to treatment with steroid tablets, though the treatment may need to be continued for a year or more.
Read more about polymyalgia rheumatica.