Hi Dear, Welcome to HCM. Understanding your concern. As per your query you are wondering if thyroid medication cause lower abdominal pain post food intake which seems to be due to disturbance of electrolytic balance of body due to excessive production of acid and it could be due to food intolerance, food allergy , bacterial or viral infection. Certain food like cabbage , dairy products can cause bloating, so avoid them till you get better . The symptoms can also occur due to side effects of medicine , so also consult doctor who prescribed them and discuss the condition . You should take small quantity of food and avoid large intake at a single time. I would suggest you to consult gastroenterologist for proper examination. Doctor may prescribe antibiotics like ornidazole , albendazole , omeprazole along , laxatives with loperamide. You should eat light and non spicy , eat fresh fruits and vegetables and eat fruits like banana. Take oral rehydrating solution as well. You should avoid intake of outside food. Keep your bed with head on higher side. drink plenty of water and take fibrous food . Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari