Hello dear I understand your concern Your left abdominal pain could be due to constipation. Hypothyroidism cause constipation. The more the bowel is not emptied the more difficult it becomes to evacuate as the liquid content of the stool is reabsorbed. The stool becomes hard and this hard stuff goes on accumulating in the gut produce symptoms. I would suggest to consult the gastroenterologist and undergo stool examination, ultrasound scan of abdomen,colonic transit studies, defecography and colonoscopy examination. Following advice will help you: Syrup Lactulose: can be taken up to 30 ml twice a day Tab bisacodyl at bedtime can useful Bulking agents like isabgol husk Lifestyle changes: Drink one spoon of honey in warm water daily in morning before the bowel movement. Eat high fiber diet. Every meal should have salads and fruits with skin. Drink 2-4 litre water daily Daily evening and morning walk for 30-45 minutes to regularize the bowel movement. Take more fruits and green leafy vegetables in the diet. Set Up regular time for the motion. Hope this may help you Contact further if follow up needed Best regards Dr. Sagar