Keshan Disease Myocarditis is a type of heart inflammation primarily linked to a deficiency of selenium, an essential mineral. It is named after Keshan County in China, where the disease was first identified. The condition can lead to heart failure and is more common in children and women of childbearing age. The disease is characterized by symptoms such as fatigue, chest pain, and irregular heartbeats. Prevention includes ensuring adequate selenium intake through diet or supplements, especially in regions where soil selenium levels are low. Early diagnosis and treatment are crucial for improving outcomes.