Whether or not six centimeters of fibroids are serious depends on where the fibroids grow and the symptoms they cause. If the six centimeter fibroid grows under the mucous membrane, or the intermural fibroid protrudes into the mucous membrane, it will make the uterine cavity enlarge, and there will be heavy menstruation and prolonged menstruation, and if it lasts for a long period of time, it will cause severe anemia, which is more serious, and it is necessary to have an operation immediately. If this fibroid grows under the plasma membrane, or grows between the walls of the muscle, it does not affect the lining of the uterus, and does not cause changes in menstruation. If the fibroid of six centimeters is pressing on the uterus and the symptoms are not very obvious, it is not very serious and can be operated or temporarily observed. If you have reached the age of near menopause and do not have any symptoms, such a large fibroid can also be observed.