Constipation in pregnancy most commonly starts during the first trimester, usually after week 8, as the hormone progesterone increases and slows down the digestive system. However, it can begin as early as 6-7 weeks or even occur later in pregnancy, including the second and third trimesters. This slowing of bowel movement is due primarily to progesterone relaxing bowel muscles, along with other contributing factors like the growing uterus, lack of hydration, decreased physical activity, iron supplements, and diet changes. Some women continue to experience constipation throughout pregnancy and even after childbirth.
Key Points on Constipation Onset in Pregnancy
- Typically starts around week 8 of the first trimester due to rising progesterone.
- Can start as early as 6-7 weeks in some women.
- May occur or worsen during the second and third trimesters as the fetus grows and puts pressure on the bowel.
- Factors such as iron supplements, dehydration, low fiber intake, and reduced activity contribute to constipation risk.
This hormonal and physical influence usually leads to slower intestinal transit time, causing harder stools and difficulty in bowel movements.
Therefore, constipation commonly begins early in pregnancy, around the first trimester week 8 and can persist or fluctuate throughout pregnancy.
