Inclusion body myositis (IBM) is an inflammatory muscle disease characterized by progressive muscle weakness and wasting. Patients suffering from IBM usually develop symptoms of IBM after age 50; however, some patients may present with symptoms as early as their 30’s. Patients typically develop difficulty in swallowing (dysphagia), weak wrists or fingers and atrophy of the forearms and/or thigh muscles.
Unlike other forms of myositis, IBM is approximately two times more common in men than in women.