Diverticulitis: This condition is a common cause of left lower abdominal pain, especially in the absence of a uterus. The normal urinalysis helps to rule out urinary tract infections, making diverticulitis a more likely diagnosis.

Constipation or Bowel Obstruction: These gastrointestinal issues can cause significant abdominal pain and are common in the general population.
Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease or ulcerative colitis can cause chronic abdominal pain and may not be directly related to the presence of a uterus.
Ovarian Cyst or Torsion: Even without a uterus, ovarian tissue may still be present, and cysts or torsion can cause severe pain.

Ectopic Pregnancy: Although the patient does not have a uterus, it's crucial to consider the possibility of an ectopic pregnancy if there's any chance of a residual uterine tissue or if the patient has undergone a uterine transplant. This condition is life-threatening and requires immediate attention.
Appendicitis: Appendicitis can present with abdominal pain that may initially be diffuse or localized to the lower abdomen, regardless of the presence of a uterus.
Ruptured Abdominal Aortic Aneurysm: This is a life-threatening condition that requires immediate surgical intervention. Although less common in younger females, it should not be overlooked.

Endometriosis: Although less likely without a uterus, endometriosis can still occur and cause abdominal pain if endometrial tissue is present elsewhere in the abdominal cavity.
Lymphoma or Other Abdominal Cancers: These conditions are less common but can cause abdominal pain and should be considered in the differential diagnosis, especially if other symptoms are present.