Congestive heart failure (CHF), also known as a syndrome, is a collection of signs and symptoms caused by a malfunction in the heart's ability to pump blood. Shortness of breath, extreme tiredness, and leg swelling are common symptoms. It can cause shortness of breath when exercising or lying down, and it can wake you up at night. Notably, although chest pain, including angina, is not usually caused by heart failure, it can occur if the heart failure is caused by a heart attack. The severity of heart failure is determined by the severity of symptoms when exercising. Obesity, kidney failure, liver disease, anaemia, and thyroid disease are all diseases that can cause symptoms similar to heart failure.