Why does hypothyroidism cause constipation?

Digestion depends on coordinated contractions that move bowel contents forward. When thyroid activity is low, that movement can become slower. More water may be absorbed from stool while it remains in the colon, making it drier or harder to pass. Constipation is a common presentation of Hypothyroidism. It can also result from low fluid intake, a change in routine, limited movement, diet, medicines, pregnancy, or another bowel condition.

Continue prescribed thyroid treatment and attend planned monitoring, because correcting low hormone levels may help restore normal gut movement. Drink fluids regularly, add fibre gradually through foods you tolerate, and build gentle activity into the day. Give yourself unhurried time for the toilet when you feel the urge. Ask a pharmacist or clinician before using laxatives regularly, particularly if you have abdominal pain or take other medicines.

Make an appointment if constipation is persistent, has changed noticeably from your usual pattern, or is not improving with simple measures. Seek urgent assessment for severe or worsening abdominal pain, repeated vomiting, a swollen abdomen, blood in stool, black stool, fever, or inability to pass stool or gas. These features need evaluation beyond a thyroid explanation.

Ask whether your thyroid levels are in the intended range, whether any medicines may be slowing your bowel, and what constipation treatment suits your health history. Mention any family history of bowel disease and any unintentional weight change.