Polymyositis

Polymyositis is a rare condition that causes inflammation and weakness in the muscles, especially those closest to the trunk like the hips and shoulders. It affects the muscular system and can make everyday activities such as climbing stairs or lifting objects difficult. The main problem is that the body's immune system mistakenly attacks the muscles, leading to muscle inflammation and damage. People with this condition often experience muscle pain, fatigue, and sometimes difficulty swallowing or breathing if the muscles involved are affected. Early diagnosis and management are important to prevent long-term muscle damage and improve quality of life.

Polymyositis is an idiopathic inflammatory myopathy characterized by chronic muscle inflammation and progressive, symmetric proximal muscle weakness. It is caused by an autoimmune-mediated attack on skeletal muscle fibers, primarily involving CD8+ T cells that invade muscle tissue, leading to muscle fiber necrosis and regeneration. The disease predominantly affects adults and is part of a spectrum of idiopathic inflammatory myopathies, distinct from dermatomyositis by the absence of skin involvement. Clinically, it presents with symmetrical proximal muscle weakness, elevated muscle enzymes such as creatine kinase, and characteristic electromyographic and histopathologic findings. It is important due to its potential to cause significant disability and its association with other autoimmune diseases and malignancies.