Hi, Thank you for your query and Welcome to HCM forum. Constipation is one of the most common complaints of patients with hypothyroidism. Symptoms of hypothyroidism and quality of life cannot be improved without the restoration of euthyroid (normalization of serum TSH) status with sufficient thyroid hormone replacement. So, You should re-do the Thyroid function test with your doctor s advice. The reason that causes hypothyroidism can also cause destruction of acid-producing cell of your stomach, thereby produce profound hypochlorhydria (Opposite of Acidity). And acidity pain usually doesn t occur around the navel region. So you might not have acidity and acid lowering drugs might be of no use. I think your abdominal pain is for constipation. Take plenty of fluid and also increase your dietary fibre intake. Try to defecate after meals particularly in the morning, thereby taking advantage of normal post-meal increases in colonic motility. Bulk forming laxatives such as methylcellulose can be used with doctor s advice as it softens the consistency of stool with a minimum of adverse effects. Anti-spasmodic drugs like Tiemonium Methylsulfate also useful. Cure ? Hypothyroidism usually needs life-long treatment with hormone replacement Hope this helps. Wish your good health.