If a hard lump is felt in the lower abdomen, it is often clinically caused by the following reasons: 1. cysts on the ovaries, which are relatively large and therefore do not cause certain symptoms clinically, so that a hard lump will be found when touched by hand unintentionally; 2. subplasmic fibroids, when subplasmic fibroids do not cause changes in menstruation clinically, so they are not detected by the patient. It is only when the patient touches the lower abdomen unintentionally that the phenomenon of hard lump is found. The initial diagnosis can be made clinically through ultrasound examination. In addition, if there is a hard lump in the lower abdomen, clinically it may be caused by intestinal flatulence, which will disappear after defecation. Therefore, no matter how you find a hard lump in the lower abdomen, it is recommended to go to the hospital as soon as possible for a gynecological examination and ultrasound examination to make a preliminary diagnosis.