Irritable Bowel Syndrome (IBS): This is the most likely diagnosis given the symptoms of chronic bloating, gas, and cramps with normal stools. IBS is a common disorder that affects the large intestine, characterized by a combination of abdominal pain, bloating, and changes in bowel movements, which can include constipation, diarrhea, or both.

Small Intestine Bacterial Overgrowth (SIBO): This condition occurs when there is an abnormal increase in the bacteria that inhabit the small intestine, leading to bloating, gas, and abdominal pain. It's a common cause of bloating and gas in patients with normal bowel movements.
Lactose Intolerance or Other Food Intolerances: Intolerance to lactose or other foods (like gluten, fructose) can cause bloating, gas, and abdominal cramps due to the inability to properly digest these substances.
Functional Dyspepsia: This condition involves recurring signs and symptoms of indigestion that have no obvious cause. Symptoms can include bloating, gas, and abdominal discomfort.

Celiac Disease: An autoimmune disorder where the ingestion of gluten leads to damage in the small intestine. It can cause abdominal pain, bloating, and gas, among other symptoms. Missing this diagnosis could lead to malabsorption of nutrients and other complications.
Inflammatory Bowel Disease (IBD): Conditions like Crohn's disease and ulcerative colitis can cause chronic abdominal pain, bloating, and changes in bowel habits. Although normal stools are mentioned, early or mild cases might not always present with diarrhea or blood in the stool.
Ovarian Cysts or Other Gynecological Issues: Conditions such as ovarian cysts, endometriosis, or pelvic inflammatory disease can cause abdominal pain and bloating. These conditions are critical to identify due to potential complications like ovarian torsion or infertility.

Gastroparesis: A condition where the stomach takes too long to empty its contents, leading to bloating, nausea, and abdominal pain. It's less common but can be a cause of chronic bloating and discomfort.
Intestinal Obstruction: A blockage that prevents the normal flow of the products of digestion, which can cause severe abdominal pain, bloating, and constipation. Although rare and usually presenting with more severe symptoms, it's a critical diagnosis not to miss.
Carcinoid Syndrome: A rare condition caused by a carcinoid tumor that can produce excessive amounts of serotonin, leading to diarrhea, abdominal cramps, and bloating, among other symptoms.