Subserosal fibroids typically develop on the outer uterine wall. This type of fibroid tumor can continue to grow outward increasing in size. The growth of a subserosal fibroid tumor will put additional pressure on the surrounding organs. Therefore, symptoms of subserosal fibroid tumors usually do not include abnormal or excessive menstrual bleeding or interfere with a women’s typical menstrual flow.
Intramural fibroid tumors typically develop within the uterine wall and expand from there. These uterine fibroids are the most common. When an intramural fibroid tumor expands, it tends to make the uterus feel larger than normal, which can sometimes be mistaken for pregnancy or weight gain.
The least common of the various types of fibroid tumors are submucosal fibroids. These fibroids develop just under the lining of the uterine cavity. Large submucosal fibroid tumors may increase the size of the uterus cavity, and can block the fallopian tubes which can cause complications with fertility. Some fibroid tumors don’t produce any symptoms at all, while others can be severely symptomatic.
Pedunculated uterine fibroids occur when a fibroid tumor grows on a stalk, resulting in pedunculated submucosal or subserosal fibroids. These fibroids can grow into the uterus and also can grow on the outside of the uterine wall. Symptoms associated with pedunculated fibroid tumors include pain and pressure as the fibroids can sometimes twist on the stalk.