Fifteen weeks pregnant lower abdomen often bulging hard, may be paroxysmal contractions caused by the clinical manifestations, the patient needs to bed rest, if necessary, birth control treatment. When contractions appear, the stomach will feel hard and tight, such as in the 15th week of pregnancy paroxysmal contraction phenomenon, the patient should walk less, avoid carrying heavy objects, bed rest, if the rest can be relieved, consider false contractions, no need to be nervous. If the stomach is frequently hard and tight, and rest does not relieve, consider the preeclampsia, need to immediately consult the doctor, under the guidance of the doctor to take appropriate medication to protect the fetus for treatment. In short, fifteen weeks pregnant with the lower abdomen often bulging hardness is recommended to go directly to the hospital for examination to determine the cause of the disease, under the guidance of the doctor to take the appropriate medication, to avoid causing harm to the mother and fetus.