She could barely stand up, let alone walk half a block. Many women experience morning sickness in the early months of pregnancy. This nausea, so named because some women have it only when they get up in the morning, can actually occur at any time of the day or night. Some women can't keep anything down. Others wish they could throw up, but can't.
Nausea is just one of the many signs of pregnancy.
It's also a particularly obvious one if you are throwing up all the time. The hormonal changes that occur during pregnancy are believed to be the cause of morning sickness. Dr. Montgomery has his own unsubstantiated theory about the nausea of pregnancy. He thinks the body's metabolism needs to change in order for a woman to begin putting on extra weight. So, in its uncomfortable way, morning sickness is heartening to some women who want to know that they are, and continue to be, pregnant.