The increase in the size of the heart is called cardiomegaly. Some symptoms of heart enlargement are visible on the body such as difficulty in breathing, swelling in the knees, dizziness, severe chest pain, etc. When the size of the heart increases, the heart has a lot of trouble pumping blood. Due to this, the risk of heart-related problems or stroke increases significantly. 

For your information, let us tell you that usually the size of the heart is about a fist but the average weight of the heart is about 10 ounces. It is located a little towards the left in the middle of the chest. The heart is responsible for blood circulation in the entire body. Due to this, the risk of stress, infection and heart-related diseases is reduced. The size of the heart can increase due to exercise during pregnancy or due to heart disease. 

Your heart size may increase for several reasons:-

as I got older

With age, the size of the heart may increase slightly, especially the left ventricle. The heart wall may become thicker, making it difficult for the heart to fill with blood.

Exercise

Excessive exercise can change the size and shape of the heart. This is called athletic heart and may increase the risk of certain heart problems in some people.

Enlarged heart

Also known as cardiomegaly. An enlarged heart can be a symptom of an underlying problem. This can include heart disease, high blood pressure, thyroid disease, or pregnancy.

This problem can occur at birth

Some people are born with conditions that can cause an enlarged heart. An enlarged heart can be diagnosed with a chest X-ray, echocardiogram, cardiac catheterization, blood tests, CT scan, MRI, exercise and stress tests, or biopsy.