The most common symptom of sacroiliitis is pain and stiffness in the lower back, hip, buttock, or leg. The symptoms become more pronounced after sitting for a while and then rising from a chair. The pain may worsen when making a sudden movement in bed, leading to lost sleep. The discomfort is also usually more pronounced when getting out of bed in the morning. A low-grade fever is another sign of sacroiliitis and comes from inflammation.

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