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How old are you? Female or male? How tall are you? How much do you weigh? Any weight change? Any symptoms? What are meals like? Any exercise? Any change of stool shape? Any medical problem? Any surgeries? Any medications including over-the-counter pills? Any family medical history?
When did you start to take Synthroid? Is your hypothyroidism controlled well? Any symptoms such as abdominal pain, bloating, nausea, vomiting? Do you take fiber supplements and enough liquid? When did the constipation start?
It could be due to hypothyroidism. But you should slowly begin to eat more fresh fruits and vegetables each day. Choose whole-grain breads and cereals. If you can't, take Metamucil with enough fluid. Take a walk every day. Don't ignore the urge to have a bowel movement.
You should have evaluation of how well food moves through the colon (colonic transit study). You swallow a capsule containing markers that show up on X-rays taken over several days in order to look for signs of intestinal muscle dysfunction and how well food moves through the colon.