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Hyperemesis Gravidarum and the pelvic floor


May 15th is International Hyperemesis Gravidarum (HG) Awareness Day. Much worse than ‘morning sickness’ HG is characterised by prolonged and severe nausea and vomiting, which can cause dehydration, weight loss and malnutrition. It's not known what causes HG, or why some women get it and others do not, but some experts believe it is linked to the changing hormones in the body that occur during pregnancy. There is also some evidence that it runs in families. In this blog, we want to focus on HG and the pelvic floor.


A refresher on the pelvic floor

You’ll remember that the pelvic floor muscles span the bottom of the pelvis and - among other things - they provide support to the pelvic organs: the bladder, bowel and uterus. They serve almost like a trap door, keeping us continent of urine, faeces and wind. Remember we have loads of easy-to-digest pelvic floor education in our online, foundation course, Essentials by Umi, which is you can access at no cost with our Umi Free membership.


The pelvic floor in pregnancy


During pregnancy, there are many hormonal changes going on, including an increase in relaxin, oestrogen and progesterone. Together, these pregnancy hormones help the connective tissues and ligaments which support your bones and muscles to become softer, to accommodate your pregnancy and prepare for birth. These circulating pregnancy hormones also have an affect on the pelvic floor, leaving them having to work harder for the same pre-pregnancy effect. Bear in mind, too, that as the pregnancy progresses and the uterus gets heavier, this will put additional strain on the pelvic floor muscles.You can learn lots more about pregnancy and the pelvic floor in our online course, Pregnancy by Umi, which you can access via our Umi Plus membership.

Why is HG relevant to the pelvic floor?

Vomiting and heaving can cause downward pressure on the pelvic floor muscles. With HG, this downward pressure is likely to be repetitive and persistent, because of the nature and longevity of the condition. Unlike regular pregnancy sickness, HG may not get better until 16 to 20 weeks' gestation, and may not clear up completely until the baby is born.

If the pelvic floor muscles cannot meet the demands of the downward pressure being generated during episodes of vomiting or heaving, either because they are weak or fatigued or simply because they are overwhelmed by the amount of pressure being placed upon them, you may experience pelvic floor symptoms. These symptoms could be stress urinary incontinence (leaking urine), faecal incontinence (leaking stool), incontinence of flatus (passing wind unintentionally) or symptoms or pelvic organ prolapse (POP). POP is the descent of one or more of the pelvic organs into the vaginal canal. Common symptoms include a feeling of heaviness or dragging in the vagina, pressure in the pelvic area or seeing or feeling a bulge.


What can I do to support my pelvic health with HG?

First off, please seek help if you’re experiencing symptoms of HG. Speak to your GP, midwife or care provider as soon as possible. Anecdotally, lots of people with HG talk of not being taken seriously. If this is your experience, do you have someone who can advocate on your behalf? There are medicines that can be used in pregnancy, including during the first trimester, to help improve the symptoms of HG, for example anti-emetics to relieve the sickness.


If you have had HG in a previous pregnancy, you are more likely to get it in your next pregnancy than someone who has never had it before, so it's worth doing some planning in advance if you are able to. See a pelvic health physio, if possible, prior to a subsequent pregnancy. You can go privately if