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Big breasts are common and almost all women in the world experience it. However, you still have to pay close attention to the size difference. The reason is, in some cases, large breasts on one side can be a sign of certain diseases
More than 50% of women in the world have one-sided breasts. The left breast, generally looks bigger than the right breast. The size difference between the two can reach about 20%.

Various Causes of Side Big Breasts
There are various things that can cause large breasts on one side. The following are among them:
Breast development in adolescence
When women enter puberty, breasts begin to grow. Not infrequently the development of the left and right breasts experiences differences, so that the shape or size of the breasts looks different.
This condition is normal and nothing to worry about because over time, the size or shape of the breasts can become the same. However, if your breasts still look different after 16 years of age or near the end of puberty, chances are you'll have one large breast into adulthood.
Menstruation
At the beginning of the menstrual cycle, some women may feel a change in the breasts, including a large side breast. The influence of breast development in adolescence will be more pronounced during menstruation.
This is normal because during menstruation, the mammary glands will experience swelling due to the influence of hormonal changes during menstruation.
Habits in breastfeeding
The habit of breastfeeding can also cause one-sided large breasts. It is recommended that you use both breasts alternately when breastfeeding, so that one-sided large breasts do not occur.
Besides these three things, other things that can also cause one-sided large breasts are the anatomical position of the breasts that are not parallel, hormonal changes, genetic or hereditary factors, and the effects of pregnancy. If it's caused by these things, then you also don't need to worry.
However, if the breast size is very different between the right and left, you should be more careful. A study says that women who experience this have a greater risk of developing breast cancer.
In addition, you also need to be alert if you experience a sudden change in breast size or large breasts. Because this condition can be a sign of a breast cyst or breast cancer.
Large breasts are common, but you are still advised to consult a doctor if you feel that there is a significant change in the size and shape of your breasts.
The doctor will carry out further examinations and possibly recommend a mammography or breast ultrasound to determine the cause of your large side breast.