The period that occurs between the 4th and 6th week of pregnancy, marks the start of morning sickness for most women. It lasts until the 14th to 16th week. So, that is it about knowing when does morning sickness end in pregnancy. Now that you have got your answer, why not give you some more important details regarding morning sickness.Starting off with the symptoms, nausea is the most prominent one. This might be characterized with or without vomiting. However, this might be accompanied by other symptoms such as rapid pulse rate, vomiting blood, severe vomiting, little urine or dark urine, dizziness or fainting symptoms. Also, backaches, constipation, darkening of areola, salivation, feeling sleepy, fatigue, food cravings, lower abdominal cramps, swollen breasts and other symptoms of pregnancy may also accompany morning sickness. Here's more on signs of morning sickness. It is believed that morning sickness indicate a healthy pregnancy. However, this has not been scientifically proven. Although, there have been many cases where lack of morning sickness showed higher incidence of miscarriage, there are as many researches showing that the correlation is not true.As a continuation of this article on when does morning sickness end, I would like to mention that doctors have not been able to determine the cause of this condition as yet. Although causes are not clear, experts believe that hormonal changes have an important part to play here. There are also chances that severe vomiting or nausea may be caused due to other medical conditions. This is however, a rare occurrence.