Difference of the size between right and left breasts
When the difference of the size of both breasts appears, it tends to be considered as mastopathy.
Mastopathy is caused by the decrease of female hormone due to aging. Since most cases are transient changes, they are not treated and will be a follow-up examination.
So the sign of the disease is easily overlooked.
To find this type of breast cancer, it is important to check if only one side of of brassiere is tight.