Up to 80 percent of pregnant women experience nausea and vomiting in the first trimester. Find out how long these difficult symptoms typically last.

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Morning sickness is one of the most common early pregnancy symptoms, but the severity varies for every person. Some women feel a slight queasiness that comes and goes, while others feel sick enough to run to the bathroom multiple times each day. So when does morning sickness usually start and end? Here's a guide for parents-to-be.

When Does Morning Sickness Start?

While the morning sickness timeline isn't set in stone, most women start to feel queasy halfway through the first trimester, between weeks six and eight. "It's almost unheard-of to get morning sickness prior to week six, and generally, it's not going to start after week 14," says Michele Hakakha, M.D., FACOG, an OB-GYN in Beverly Hills and author of Expecting 411. The exception: Late in pregnancy, your baby may push down on your stomach and intestines, causing nausea. Many of the same strategies you use for standard morning sickness can also help with this late-pregnancy nausea. 

When Does Morning Sickness End?

Most women start to feel much better by week 16. Only a small number (around 10 percent of moms-to-be) experience nausea and vomiting all pregnancy long. If your morning sickness isn't letting up, let your doctor know. There are certain medications that can help you feel better, like ginger candy or a vitamin B6 supplement. Severe weight loss as a result of illness may be dangerous to a developing fetus and should be treated either at home or in a hospital setting, says Marra Francis, M.D., an obstetrician-gynecologist in The Woodlands, Texas.

Also alert your doctor if morning sickness stops abruptly during the first trimester—but keep in mind that this doesn't necessarily mean something is wrong with your pregnancy. For some women, nausea is a symptom that they feel every day, and for others, nausea is intermittent.

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