Irritable Bowel Syndrome (IBS): This condition is characterized by abdominal pain associated with bowel movements or changes in bowel habits. The pain often occurs after eating, especially if the meal is large or contains trigger foods. IBS is a common condition, making it a likely diagnosis for lower abdominal pain immediately after eating.

Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease and ulcerative colitis can cause abdominal pain after eating due to inflammation in the digestive tract. While not as common as IBS, IBD is a significant consideration, especially if there are other symptoms like diarrhea, weight loss, or blood in the stool.
Gastroesophageal Reflux Disease (GERD): Although GERD typically causes upper abdominal or chest pain, some individuals may experience lower abdominal discomfort, especially if the reflux irritates the lower esophagus or stomach. Eating can trigger or worsen symptoms.
Constipation: Hard stools or difficulty passing stools can lead to lower abdominal pain, which may be exacerbated by eating, especially if the diet lacks sufficient fiber or if there is an underlying motility issue.

Appendicitis: Although appendicitis typically presents with pain that initially is diffuse or around the navel and then localizes to the lower right abdomen, the pain can sometimes be more generalized or on the left side. It's crucial to consider appendicitis, as it requires urgent surgical intervention.
Intestinal Obstruction: This is a life-threatening condition where the intestine is partially or completely blocked, which can cause severe abdominal pain, vomiting, and constipation. The pain can occur after eating if the obstruction is partial and eating increases intestinal pressure.
Ectopic Pregnancy: In women of childbearing age, an ectopic pregnancy can cause lower abdominal pain, which might be exacerbated by eating due to increased abdominal pressure. This condition is a medical emergency.
Ovarian Torsion: This condition involves the twisting of an ovary, which can cause severe, sudden lower abdominal pain. While not directly related to eating, the pain can be constant and might seem to worsen with any activity, including eating.

Malrotation with Volvulus: A congenital condition where the intestine twists around itself, cutting off its blood supply. It's rare in adults but can cause severe abdominal pain after eating due to increased intestinal activity.
Chronic Intestinal Pseudo-obstruction: A rare condition characterized by impairment of the muscle contractions that move food, fluid, and air through the intestines. Symptoms can include abdominal pain after eating, among others.
Meckel's Diverticulum: A small bulge in the small intestine that can cause pain, especially if it becomes inflamed or if there is an ulceration. The pain might be exacerbated by eating.