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What is myasthenia gravis? Understanding This Rare Autoimmune Neuromuscular Disorder Myasthenia Gravis (MG) may sound like a complicated medical term, but its real-life effects are surprisingly simple — and frustrating. Imagine trying to lift your arm, smile, or speak clearly, only to feel your muscles grow weaker the more you try. That’s what living with Myasthenia Gravis can be like. This rare autoimmune disease affects muscle strength and control , often leaving people fatigued and struggling with basic movements. In this article, we’ll break down what Myasthenia Gravis is, what causes it, how it's diagnosed, and what treatments are available. Definition Myasthenia Gravis is a chronic autoimmune neuromuscular disorder that causes weakness in the skeletal muscles — the muscles your body uses for movement. The name literally means “grave muscle weakness,” though with proper treatment, many people live active lives. In MG, the body’s immune system produces antibodies th...