Constipation: Despite having "nice big poops," constipation can still cause lower left quadrant (LLQ) pain due to the buildup of stool in the rectum or sigmoid colon, which can lead to intermittent pain.

Functional abdominal pain: A common condition in children, characterized by recurrent abdominal pain without an identifiable cause, which could include LLQ pain.
Gastroenteritis: Inflammation of the stomach and intestines, often due to viral or bacterial infections, can cause LLQ pain, among other symptoms.
Mesenteric lymphadenitis: Inflammation of the lymph nodes in the mesentery, which can mimic appendicitis but is more commonly associated with viral infections.

Appendicitis: Although less likely given the location of the pain (LLQ instead of the typical right lower quadrant), appendicitis can present atypically, especially in children, and is a medical emergency.
Intussusception: A condition where a part of the intestine slides into an adjacent part, which can cause severe abdominal pain, vomiting, and bloody stools. It's a surgical emergency.
Inflammatory bowel disease (IBD): Conditions like Crohn's disease or ulcerative colitis can cause chronic abdominal pain, including LLQ pain, and require prompt diagnosis and treatment.

Diverticulitis: Inflammation of a diverticulum in the digestive tract, which is rare in children but can cause LLQ pain.
Ovarian torsion or ovarian cyst: In prepubescent girls, these conditions can cause severe LLQ pain and are surgical emergencies.
Lead poisoning: Can cause abdominal pain, including LLQ pain, among a constellation of other symptoms, and is important to consider in areas with high risk of lead exposure.