What causes morning sickness during pregnancy?


Morning sickness has become somewhat of a “norm” during pregnancy. But what if it’s not supposed to be?
There’s evidence that going into pregnancy in an estrogen dominant state — meaning that the ratio of estrogen to progesterone is high — can drive an array of issues, including nausea and vomiting during pregnancy.
“Morning sickness in early pregnancy is another hazard for PMS sufferers. In fact, many will tell you that the name is wrong - they are sick all day, not just in the morning. When this problem is severe it is called hyperemesis. This seems to mean that in former times doctors (who were always male, of course) considered mild vomiting in early pregnancy to be quite natural, something to be expected and which the women should learn to accept...In fact it is caused by a hormonal imbalance before the placenta is fully formed...” — Dr. Katharina Dalton
Progesterone deficiency can have a compounding effect on the body’s inability to properly detoxify estrogen, leading to nausea.
“X-ray studies have demonstrated that there are spasms of the small intestine (near the bile duct) associated with estrogen-induced nausea.” — Dr. Ray Peat
Of course preventative measures are much easier to manage than addressing the problem once it’s been established. There’s a bit of trial and error when it comes to resolving this for my clients, as antidotes can vary greatly. But one thing that does work for most is balancing blood sugar. Supporting yourself with the right foods at the right times is key.
It’s important to note that there are other factors that can drive morning sickness and not everything will always be preventable. But resolving estrogen dominance prior to preconception could make way for less stomach turning during pregnancy. This is something my preconception clients and work very hard to address if present.
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This is not medical advice. Always consult your healthcare professional before pursuing any changes to your personal healthcare regime.



Dalton, K. Holton, D. (1994). PMS: The Essential Guide to Treatment Options. San Francisco, CA: HarperCollinsPublishers.

East West Healing. (2012). The Science of Morning Sickness. Retrieved from: https://eastwesthealing.com/the-science-behind-morning-sickness/.

Littlewood, K. (2019). The Big Estrogen Hoax. Retrieved from: https://balancedbodymind.com/blog/2019/6/12/the-big-estrogen-hoax.

Littlewood, K. (2019). Fasting and calorific restriction- Increased longevity or just a slower death?. Retrieved from: https://balancedbodymind.com/blog/tag/Ray+Peat.

Peat, R. Eclampsia in the Real Organism: A Paradigm of General Distress Applicable in Infants, Adults, Etc.. Retrieved from: http://raypeat.com/articles/aging/eclampsia.shtml.

SGOURAKIS, E. (2012). me, pregnant. Retrieved from: http://www.thenutritioncoach.com.au/real-food/me-pregnant/.


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Remember: this post is for informational purposes only and may not be the best fit for you and your personal situation. It shall not be construed as medical advice. The information and education provided here is not intended or implied to supplement or replace professional medical treatment, advice, and/or diagnosis. Always check with your own physician or medical professional before trying or implementing any information read here. While the owner of this website tries to keep the information up to date, there may be things that are out-of-date and out of their control.