O'Sullivan-Mcleod syndrome, also known as OS-McL, is a rare genetic disorder characterized by muscle weakness, stiffness, and cramps. This condition is caused by mutations in the SCN4A gene, which affects the function of sodium channels in muscle cells. There are no known synonyms for O'Sullivan-Mcleod syndrome, as it is a unique condition with its own set of symptoms and genetic causes. However, it is sometimes referred to as sodium channelopathy because of the specific gene mutation that causes the disorder. Treatment for O'Sullivan-Mcleod syndrome typically involves managing symptoms and personal care, such as physical therapy and medication for muscle pain.