[Vomiting after the first trimester of pregnancy: an alarming symptom].

Nausea and vomiting are common problems of pregnancy. Three pregnant women, 27, 25 and 28 years of age, presented with vomiting in the third trimester. The causes appeared to be maternal small bowel volvulus, which was derotated after primary caesarean section, an ileocecal abscess, which was the first manifestation of Crohn's disease, and acute pyelonephritis, treated with cefuroxim. The second and third babies were born spontaneously; no maternal or foetal mortality occurred. Persistent vomiting after the first trimester of pregnancy should be considered an alarm symptom which always requires further investigation.