Cori's disease, also known as Cori disease or glycogen storage disease type III, is a rare genetic disorder that affects the body's ability to break down glycogen, a stored form of sugar. This condition is caused by a deficiency of the enzyme debranching enzyme, which is essential for the proper metabolism of glycogen. As a result, glycogen accumulates in the liver and muscles, leading to various health issues. Symptoms of Cori's disease can include low blood sugar levels, muscle weakness, and growth delays in children. Diagnosis is typically made through blood tests, genetic testing, and a liver biopsy. While there is no cure, management strategies may involve dietary changes and regular monitoring to help control symptoms and improve quality of life.