Moderate severity55% reported by patientsICD-10: M25.60
Summary
Joint stiffness that is worst in the morning and improves with movement, a hallmark feature of inflammatory arthritis.
What is it?
Morning stiffness is the perception of tightness and reduced range of motion in joints or muscles upon waking that improves over time with activity. The duration of morning stiffness is diagnostically significant: stiffness lasting under 30 minutes suggests degenerative arthritis (osteoarthritis), while stiffness lasting more than 1 hour is characteristic of inflammatory arthritis — particularly rheumatoid arthritis, psoriatic arthritis, and ankylosing spondylitis. Fibromyalgia and polymyalgia rheumatica also cause prolonged morning stiffness.
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