Irritable Bowel Syndrome (IBS): This condition is characterized by recurring abdominal pain associated with bowel movements, changes in bowel habits, and often relief of pain after defecation. The symptoms described fit well within the diagnostic criteria for IBS, making it a plausible first consideration.

Constipation: Hard stools or difficulty passing stools can lead to cramping abdominal pain, especially after a large bowel movement. The pain may be due to the effort required to pass the stool or the temporary obstruction caused by the hard stool.
Hemorrhoids: Painful hemorrhoids can cause cramping pain during and after bowel movements, especially if they are thrombosed or prolapsed. The pain is usually more localized to the anal region but can radiate to the abdomen.
Anal Fissure: A tear in the lining of the anus can cause severe pain during and after bowel movements. The pain is typically sharp and can be accompanied by bleeding.

Intestinal Obstruction: Although less common, intestinal obstruction can present with cramping abdominal pain that may worsen after bowel movements. It's crucial to consider this diagnosis due to its potential for severe complications if not promptly treated.
Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease and ulcerative colitis can cause recurring abdominal pain, changes in bowel habits, and sometimes blood in the stool. These conditions require specific management and can have significant complications if not diagnosed and treated properly.
Diverticulitis: Inflammation of a diverticulum in the wall of the colon can cause severe abdominal pain, usually on the lower left side, which may worsen after bowel movements. It's a condition that requires medical attention to prevent complications like abscess formation or perforation.

Colonic Volvulus: A twisting of a portion of the colon can cause severe abdominal pain and obstruction. It's a rare condition but one that requires emergency surgical intervention.
Ischemic Colitis: Reduced blood flow to the colon can cause abdominal pain, which may be exacerbated by bowel movements. It's more common in older adults and those with cardiovascular disease.
Colorectal Cancer: Although abdominal pain is a non-specific symptom, in some cases, it can be associated with colorectal cancer, especially if accompanied by changes in bowel habits, weight loss, or blood in the stool. Given its potential impact, it's essential to consider this diagnosis, especially in older adults or those with risk factors.