Organ failure occurs when an organ in the body stops functioning properly, which can lead to serious health issues. Common organs that can fail include the heart, lungs, kidneys, and liver. When an organ fails, it cannot perform its essential functions, which can disrupt the body's overall balance and health. There are various causes of organ failure, including disease, injury, and infection. Symptoms may vary depending on the organ affected, but they often include fatigue, pain, and difficulty breathing. Treatment options depend on the severity of the failure and may involve medication, surgery, or organ transplantation.