If a woman has a relatively large hard lump below the navel, it is often due to the following reasons: 1, if there is a history of menopause, it is likely to be pregnant, the enlarged uterus in the abdomen can be felt in the case of hard lumps, in the clinic often have a history of menopause. 2, huge ovarian cysts, often the patient does not have any symptoms, and ultrasound can be diagnosed through the ultrasound examination. 3, fibroids under the plasma membrane, due to the plasma membrane of the uterine fibroids will not cause menstrual changes, often unintentionally felt in the abdomen with a lump, it is recommended to do surgery as soon as possible in the clinic. In addition, cancers of the fallopian tube can also present with a mass in the lower abdomen. Therefore, if this situation occurs, go to the hospital as soon as possible for examination and timely treatment.