Increase in the size of the uterus is usually caused by fibroids, adenomyosis, pregnancy, etc. It may cause pain in the stomach. 1. Fibroids: Fibroids can grow anywhere in the uterus, one or more, and they increase the size of the uterus. If the fibroids are small, the patient may not have any symptoms. If the fibroids are large, numerous or degenerate, they may cause pain in the lower abdomen. 2. Adenomyosis: Adenomyosis is a condition in which the uterus grows uniformly due to the growth of the endometrium into the myometrium. The patient will have severe menstrual cramps with menstruation and will also have stomach cramps. 3. Pregnancy: After pregnancy, the size of the uterus will gradually increase, and if there is a miscarriage or physiological contractions, women will experience discomfort such as lower abdominal pain. Patients with increased uterine volume with stomach pain, need to go to the regular hospital, identify the cause of the disease, and follow the doctor’s instructions for treatment.