Which of the following statements is true about hysteromyoma?

Does the subject want to ask "which statements about hysteromyoma are correct"?

1, Etiology: The exact etiology of uterine fibroids is not completely clear, but studies have shown that high estrogen levels are related to the growth and development of fibroids.

2. Symptoms: Many patients with hysteromyoma have no obvious symptoms, but some common symptoms include menorrhagia, lower abdominal pain or discomfort, frequent urination, constipation and so on.