Patterns of nausea during first trimester of pregnancy

This descriptive study examined pregnancy nausea to determine whether nausea occurred more frequently during the morning hours than during other times of day and if certain patterns of nausea exist. The 19 women who participated in the study kept daily diaries of their nausea experiences over a 7-day period, noting the time of occurrence. Nausea was reported most frequently during waking hours, ranging from 40.3% of the time between 7 p.m. and 10 p.m. and 43.9% between 3 p.m. and 6 p.m. Most nausea reported by subjects was mild, although 18% of the nausea reported between 11 p.m. and 2 a.m. was severe. Four patterns of nausea were identified: morning peak, evening peak, bimodal, and all day. Whereas some women displayed fairly consistent daily patterns of nausea, others reported variations in the occurrence or severity of nausea over the 7-day study period.