Page 1Apple_logo_blackPage 1Page 1Page 1TrianglePage 1close iconPage 1Page 1Fill 1Group 3!Fill 1Icons / icon-checkicon-cvvCVVCVVicon-down-arrowicon-upicons/icon-menu-v2Icons / icon-multiplyicon-plusIcons / icon-quoteicon-up-arrowicon-upFill 6logo/logo-bluelogo-smalllogoPage 1Page 1Page 1GroupPage 1GroupFill 1Triangle 1plus-buttonPage 1Page 1Page 1Page 1Fill 4

Who the Hell is Braxton Hicks? And What is He Doing in My Uterus?

So you have hit your second trimester and you’ve started to hear the term “Braxton Hicks.”

Just when you’re starting to become aware of the fact that your body is changing, it’s getting weird, and there is a human growing in there, a muscle flexes. A muscle that you’ve never given much thought to (well, maybe once per month). A new sensation to add to your growing list of things you’ll experience during pregnancy.

Ah, good ‘ol Braxton Hicks. A little British man “with a cheerful expression” named John Braxton Hicks has now forever implanted into your pregnancy journey.

What are Braxton Hicks Contractions?

Braxton Hicks contractions are pretty much any non-labor contractions. The American College of Obstetricians and Gynecologists recommends a few tricks to decide whether or not the sensations you feel are Braxton Hicks contractions or true labor contractions. Understanding the timing of contractions—how far apart contractions are, how long each contraction lasts, whether they are regular and getting closer together—is one trick.

When we interviewed members of the birth community about Braxton Hicks vs. labor contractions they also added their suggestions for distinguishing the two on your own. But, really the only way to know is to have a medical professional do a cervical exam. Labor contractions, by definition, are contractions that cause cervical change. Once the cervix starts to dilate, labor has begun and every contraction will start working its way to the end goal of getting that baby out.

As for those Braxton Hicks contractions, the running assumption is that they help tone and prepare your body for labor. The uterus is smooth muscle, its flexes are involuntary, like the heart. You cannot directly cause your uterus to contract, just as you cannot directly cause your heart to beat.

The pregnant uterus is truly an incredible organ: it will grow from the size of an orange to the size of a watermelon by the end of pregnancy. It will constantly change and strengthen to prepare for its big moment as a baby expulsion machine. Perhaps the Braxton Hicks contraction is your uterus’ way of hitting the gym.


Labor Contractions are contractions that cause cervical change.

So, now back to the question at hand, who the hell is Braxton Hicks?

Dr. John Braxton Hicks gets the naming rights to those non-labor-inducing contractions you might feel throughout pregnancy because he was the first one to acknowledge that the magic and wonder of the pregnant uterus begins long before labor. In fact, before he came onto the obstetric scene in the mid- 1800’s, doctors believed that the uterus acquired a “new power to contract” only at the very end of pregnancy.

Not so, argued Dr. Braxton Hicks:

“After many years’ constant observation, I have ascertained it to be a fact that the uterus possesses the power and habit of spontaneously contracting and relaxing from a very early period of pregnancy.”

To jump to the end of his long road of uterine enlightenment, basically, Dr. Braxton Hicks spent nearly a decade putting his hands on many pregnant bellies, feeling the tightening and releasing of muscle flexing. When he realized that these patients did not have a baby on the way, he concluded that not only were these contractions spontaneous but also a natural part of pregnancy. In his descriptions, he noted that the contractions began as early as three months and increase in the second trimester. As Dr. Braxton Hicks notes:

“Most frequently it occurs every five or ten minutes, sometimes even twice in five minutes.”

Although over 150 years have passed since he first described these non-labor-inducing contractions, the name “Braxton Hicks” has remained attached to them.

While you wait for the big day, think of that incredible muscle of yours preparing for her big moment to shine.  (And my apologies if your contractions start taking on a British accent.)



Learn about your own Braxton Hicks contractions with the Bloomlife at-home contraction monitor.


Share the article

Molly Dickens, PhD

About Molly

Molly has her PhD in Physiology and spent over a decade as an academic research scientist slightly obsessed with the colliding worlds of brain science, hormones, stress and the reproductive system. Nowadays she heads up Content and Community at Bloomlife and edits Preg U. Science is still her jam and she can't help but continue to dive into the research world to find interesting bits about pregnancy and parenting.


Sign up for the Preg U Newsletter!


  • ex:
  • ex: Jennifer