Heart enlargement, also known as cardiomegaly, may have many causes, such as heart failure or high blood pressure. Antonyms for this condition would include terms such as heart reduction, heart shrinkage, and heart atrophy. These terms suggest a decrease in the size or volume of the heart. If left untreated, heart enlargement can lead to serious health problems, including heart failure or arrhythmias that can be life-threatening. Therefore, early diagnosis and treatment are critical, and patients should seek medical advice if they experience any symptoms of heart enlargement, such as shortness of breath, chest pain, or swelling in the legs or abdomen.