Whether morning sickness is caused by levels of the pregnancy hormone hCG or a deficiency of B vitamins, the 50% of women who experience nausea and vomiting during pregnancy agree it’s a real problem. Morning sickness is not just an inconvenience; it can lead to preterm labor and other complications. Suggestions for relieving the condition include getting a diagnosis to confirm your nausea is not related to something else. Change what and how you eat—focus on fluids and nutrients. Call your doctor if it’s severe, and to be rehydrated via IV fluids if necessary. And don’t discount the mind-body connection—think positively.