Non cancerous tumours growing from the muscle layers of the womb are known as fibroids. You may not be aware of it until an ultrasound test.
One out of 15 women with infertility has fibroids but usually they do not affect pregnancy. There are only very rare cases in which the fibroids block one or both fallopian tubes and prevent sperm from fertilising an egg. Only 2 to 3 percent of infertility is caused by blocked fallopian tube with fibroids that prevents implantation of newly fertilised egg.
The size of fibroids is variable during pregnancy. While some remain the same size, some shrink and others grow during pregnancy. There is no particular cause identified as one responsible for the growth of fibroids.
Women may be genetically inclined to grow fibroids, it could also be due to hormonal changes during pregnancy, because the pregnancy hormones such as estrogen and progesterone stimulate cell growth and can cause growth of fibroids. During pregnancy, the hormonal changes can cause the fibroids to grow in size and they can become noticeable with the increase in size.
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