Background: The evolution of ulcerative colitis in pregnancy is far fr
om clear. While some authors state that the disease aggravates during
this period, other do not share this opinion. Aim: To assess the evolu
tion of ulcerative colitis in pregnancy. Patients and methods: A paire
d case-control design was used in which 15 women, with diagnosed ulcer
ative colitis at the moment of becoming pregnant, were followed for 12
months and the activity of the disease was compared with that of the
12 months preceding the pregnancy. The activity of the disease in the
period preceding the pregnancy was gathered retrospectively from the p
atient's charts. Results: The mean age of the first ulcerative colitis
crisis was 24 years. It was moderate in 49% and severe in 35% of wome
n. During pregnancy 55% of women did not have a crisis, compared with
26.7% during the period preceding pregnancy (relative risk of not havi
ng a crisis during pregnancy of 1.7). During both periods, seven women
had digestive complications, whereas extra digestive complications we
re not observed in 60% of patients during pregnancy and 11.8% of patie
nts during the preceding period. Perinatal results were similar to tho
se of the general population. Conclusions: In our group of patients th
e evolution of ulcerative colitis was better during pregnancy, reflect
ed by a lower number of crisis.