Inclusion body myositis (IBM) is an inflammatory muscle disease characterized by slowly progressive weakness and wasting of both distal and proximal muscles, most apparent in the arms and legs. The signs and symptoms include frequent falling, difficulty climbing stairs or standing up, and weak grip strength. It is incurable and progresses very slowly over time. IBM is underdiagnosed and sometimes misdiagnosed as polymyositis. Muscle biopsy and specialized tests are used for diagnosis. Management focuses on physical therapy, occupational therapy, speech therapy if swallowing is affected, and dietary support.