" Stomach or Abdominal pain occurs between the pelvic and the chest region. Stomach Pain or Abdominal pain can have multiple causes and it can be crampy, dull, achy sharp or intermittent. Common Causes: Common causes of stomach pain or stomach ache or abdominal pain includes Food Poisoning Stomach Flu Muscle Strain. Food Allergy Indigestion Constipation Lactose Intolerance Stress & Anxiety Menstruation Diarrhea Gastroenteritis Acid Reflux Vomiting Inflammation or diseases can occur in the abdomen area can ...