In the first trimester, morning nausea, sometimes accompanied by vomiting, is the most frequent annoyance; these disorders are mainly caused by high levels of estrogen and HCG in the blood.

Other problems affecting the digestive system, typical of pregnancy, are stomach burns and eruptions, probably due to slower food transit and a reduction in muscle tone of the sphincter that separates the stomach from the oesophagus.

The slowdown in the intestinal transit of food is accentuated as pregnancy progresses, mainly due to the anatomical movement of organs upwards; this is why constipation, which is quite common throughout pregnancy, tends to become a more annoying problem especially in the last quarter.

Finally, it is not infrequent that in the last few weeks of pregnancy, hemorrhoids appear, partly due to the excessive effort made for evacuation, and partly to the weight of the uterus.