Why you might still feel swollen, bloated or out of balance
At WHEN, we hear this often:
“I felt swollen and heavy for weeks. No one warned me.”
There is very little research on what happens to fluid levels after pregnancy loss, but we do know from physiology and lived experience that your body doesn’t immediately return to how it felt before. The systems that began shifting in early pregnancy don’t reverse overnight.

In early pregnancy, your body starts holding on to more fluid. Blood volume increases, and hormones like estrogen, progesterone and aldosterone tell the kidneys to retain water and salt. These changes are normal in pregnancy and happen even in the first few weeks.
After a pregnancy loss, those hormones begin to drop. But the process of shedding excess fluid can take time. You might still feel puffy or bloated. Some women notice that they need to wee more often than usual. Others find they’re sweating more, especially at night. These are signs your body is releasing what it no longer needs.
You might also notice swelling in your legs or ankles by the end of the day. For some, the feeling of being “full” or physically “out of step” can last longer than expected. This isn’t something many people talk about, but it’s common.
Small adjustments can support your body while it settles:
If the bloating or swelling becomes painful, one-sided or doesn’t improve, it’s important to check in with your GP. In rare cases, swelling can be a sign of something more serious.
There’s no research telling us exactly how long fluid symptoms last after a pregnancy loss. Most of what we know comes from studies on full-term pregnancy. But we do know that it takes time for your kidneys, hormones and circulation to adjust.
These physical changes don’t always settle straight away after a pregnancy loss. Your body needs time to adjust, and that timeframe looks different for everyone.
Aguree, S., & Gernand, A. D. (2019). Plasma volume expansion across healthy pregnancy: a systematic review and meta-analysis of longitudinal studies. BMC Pregnancy and Childbirth, 19(1), 508. https://doi.org/10.1186/s12884-019-2619-6
Akinlaja, O. (2016). Hematological Changes in Pregnancy – The Preparation for Intrapartum Blood Loss. Obstetrics & Gynecology International Journal, 4(3). https://doi.org/10.15406/ogij.2016.04.00109
Artal-Mittlemark, R. (2022). Physiology of Pregnancy – Gynecology and Obstetrics. MSD Manual Professional Edition. https://www.msdmanuals.com/en-au/professional/gynecology-and-obstetrics/approach-to-the-pregnant-woman-and-prenatal-care/physiology-of-pregnancy
Benninger, B., & Delamarter, T. (2013). Anatomical factors causing oedema of the lower limb during pregnancy. Folia Morphologica, 72(1), 67-71.
Brown, M. A., & Gallery, E. D. (1994). Volume homeostasis in normal pregnancy and pre-eclampsia: physiology and clinical implications. Baillieres Clin Obstet Gynaecol, 8(2), 287-310. https://doi.org/10.1016/s0950-3552(05)80322-0
Buckley, S. J. (2015). Executive Summary of Hormonal Physiology of Childbearing: Evidence and Implications for Women, Babies, and Maternity Care. J Perinat Educ, 24(3), 145-153. https://doi.org/10.1891/1058-1243.24.3.145
Chauhan, G., & Tadi, P. (2022). Physiology, Postpartum Changes. PubMed. https://www.ncbi.nlm.nih.gov/books/NBK555904/
Cheung, K. L., & Lafayette, R. A. (2013). Renal physiology of pregnancy. Adv Chronic Kidney Dis, 20(3), 209-214. https://doi.org/10.1053/j.ackd.2013.01.012
Conrad, K. P., Gellai, M., North, W. G., & Valtin, H. (1986). Influence of oxytocin on renal hemodynamics and electrolyte and water excretion. Am J Physiol, 251(2 Pt 2), F290-296. https://doi.org/10.1152/ajprenal.1986.251.2.F290
Crapo, R. O. (1996). Normal Cardiopulmonary Physiology During Pregnancy. Clinical obstetrics and gynecology, 39(1), 3-16. https://doi.org/10.1097/00003081-199603000-00004
Dalio, M. B., Gardenghi, L. A., & Dezotti, N. R. A. (2022). Pregnancy and Lower Limb Swelling. In S. K. Tiwary (Ed.), Approach to Lower Limb Oedema (pp. 285-294). Springer Nature Singapore. https://doi.org/10.1007/978-981-16-6206-5_19
Davison, J. M., Gilmore, E. A., Dürr, J., Robertson, G. L., & Lindheimer, M. D. (1984). Altered osmotic thresholds for vasopressin secretion and thirst in human pregnancy. Am J Physiol, 246(1 Pt 2), F105-109. https://doi.org/10.1152/ajprenal.1984.246.1.F105
Davison, J. M., Sheills, E. A., Barron, W. M., Robinson, A. G., & Lindheimer, M. D. (1989). Changes in the metabolic clearance of vasopressin and in plasma vasopressinase throughout human pregnancy. J Clin Invest, 83(4), 1313-1318. https://doi.org/10.1172/jci114017
Davison, J. M., Vallotton, M. B., & Lindheimer, M. D. (1981). Plasma osmolality and urinary concentration and dilution during and after pregnancy: evidence that lateral recumbency inhibits maximal urinary concentrating ability. Br J Obstet Gynaecol, 88(5), 472-479. https://doi.org/10.1111/j.1471-0528.1981.tb01019.x
de Haas, S., Ghossein-Doha, C., van Kuijk, S. M., van Drongelen, J., & Spaanderman, M. E. (2017). Physiological adaptation of maternal plasma volume during pregnancy: a systematic review and meta-analysis. Ultrasound Obstet Gynecol, 49(2), 177-187. https://doi.org/10.1002/uog.17360
Dobolyi, A., Oláh, S., Keller, D., Kumari, R., Fazekas, E. A., Csikós, V., Renner, É., & Cservenák, M. (2020). Secretion and Function of Pituitary Prolactin in Evolutionary Perspective. Front Neurosci, 14, 621. https://doi.org/10.3389/fnins.2020.00621
Dørup, I., Skajaa, K., & Sørensen, K. E. (1999). Normal pregnancy is associated with enhanced endothelium-dependent flow-mediated vasodilation. American Journal of Physiology-Heart and Circulatory Physiology, 276(3), H821-H825.
Duthie, L., & Reynolds, R. M. (2013). Changes in the Maternal Hypothalamic-Pituitary-Adrenal Axis in Pregnancy and Postpartum: Influences on Maternal and Fetal Outcomes. Neuroendocrinology, 98(2), 106-115. https://doi.org/10.1159/000354702
Elkus, R., & Popovich, J., Jr. (1992). Respiratory physiology in pregnancy. Clin Chest Med, 13(4), 555-565.
Ferrari, N., & Joisten, C. (2021). Impact of physical activity on course and outcome of pregnancy from pre- to postnatal. European Journal of Clinical Nutrition, 75(12), 1698-1709. https://doi.org/10.1038/s41430-021-00904-7
Fisher, C., MacLean, M., Morecroft, I., Seed, A., Johnston, F., Hillier, C., & McMurray, J. (2002). Is the pregnancy hormone relaxin also a vasodilator peptide secreted by the heart? Circulation, 106(3), 292-295.
Gonzalez-Campoy, J. M., Romero, J. C., & Knox, F. G. (1989). Escape from the sodium-retaining effects of mineralocorticoids: role of ANF and intrarenal hormone systems. Kidney Int, 35(3), 767-777. https://doi.org/10.1038/ki.1989.51
Hadianti, D. N., & Sriwenda, D. (2019). The Effectiveness of Postpartum Exercise and Oxytocin Massage on Uterus Involution. Open Journal of Nursing, 09(03), 231-238. https://doi.org/10.4236/ojn.2019.93023
Hendrick, V., Altshuler, L. L., & Suri, R. (1998). Hormonal Changes in the Postpartum and Implications for Postpartum Depression. Psychosomatics, 39(2), 93-101. https://doi.org/https://doi.org/10.1016/S0033-3182(98)71355-6
Hsueh, W. A., Luetscher, J. A., Carlson, E. J., Grislis, G., Fraze, E., & McHargue, A. (1982). Changes in active and inactive renin throughout pregnancy. J Clin Endocrinol Metab, 54(5), 1010-1016. https://doi.org/10.1210/jcem-54-5-1010
Hytten, F. (1985). Blood volume changes in normal pregnancy. Clin Haematol, 14(3), 601-612.
Hytten, F. E., & Paintin, D. B. (1963). Increase in plasma volume during normal pregnancy. J Obstet Gynaecol Br Emp, 70, 402-407. https://doi.org/10.1111/j.1471-0528.1963.tb04922.x
Joo, K. W., Jeon, U. S., Kim, G.-H., Park, J., Oh, Y. K., Kim, Y. S., Ahn, C., Kim, S., Kim, S. Y., Lee, J. S., & Han, J. S. (2004). Antidiuretic action of oxytocin is associated with increased urinary excretion of aquaporin-2. Nephrology Dialysis Transplantation, 19(10), 2480-2486. https://doi.org/10.1093/ndt/gfh413
Knight, J. (2023). Pregnancy 1: effects on haematological and cardiovascular systems. Nursing Times [online]. https://emap-moon-prod.s3.eu-west-1.amazonaws.com/wp-content/uploads/sites/3/2023/08/230828-Pregnancy-1-effects-on-haematological-and-cardiovascular-systems.pdf
Li, Y., Han, B., Salmeron, A. G., Bai, J., & Chen, D. B. (2022). Estrogen-Induced Uterine Vasodilation in Pregnancy and Preeclampsia. Matern Fetal Med, 4(1), 52-60. https://doi.org/10.1097/fm9.0000000000000132
Lohr, J. M., & Bush, R. L. (2013). Venous disease in women: epidemiology, manifestations, and treatment. J Vasc Surg, 57(4 Suppl), 37s-45s. https://doi.org/10.1016/j.jvs.2012.10.121
Lumbers, E. R., & Pringle, K. G. (2014). Roles of the circulating renin-angiotensin-aldosterone system in human pregnancy. Am J Physiol Regul Integr Comp Physiol, 306(2), R91-101. https://doi.org/10.1152/ajpregu.00034.2013
Mahendru, A. A., Everett, T. R., Wilkinson, I. B., Lees, C. C., & McEniery, C. M. (2014). A longitudinal study of maternal cardiovascular function from preconception to the postpartum period. Journal of hypertension, 32(4), 849-856.
Morrissey, S. E., Newth, T., Rees, R., Barr, A., Shora, F., & Laycock, J. F. (2001). Renal effects of recombinant prolactin in anaesthetized rats. Eur J Endocrinol, 145(1), 65-71. https://doi.org/10.1530/eje.0.1450065
Nichols, K. M., Henkin, S., & Creager, M. A. (2020). Venous Thromboembolism Associated With Pregnancy: JACC Focus Seminar. J Am Coll Cardiol, 76(18), 2128-2141. https://doi.org/10.1016/j.jacc.2020.06.090
Ouzounian, J. G., & Elkayam, U. (2012). Physiologic changes during normal pregnancy and delivery. Cardiol Clin, 30(3), 317-329. https://doi.org/10.1016/j.ccl.2012.05.004
Robson, S. C., Hunter, S., Moore, M., & Dunlop, W. (1987). Haemodynamic changes during the puerperium: a Doppler and M-mode echocardiographic study. Br J Obstet Gynaecol, 94(11), 1028-1039. https://doi.org/10.1111/j.1471-0528.1987.tb02286.x
Sanghavi, M., & Rutherford, J. D. (2014). Cardiovascular Physiology of Pregnancy. Circulation, 130(12), 1003-1008. https://doi.org/doi:10.1161/CIRCULATIONAHA.114.009029
Scott, D. E. (1972). Anemia in pregnancy. Obstet Gynecol Annu, 1, 219-244.
Soma-Pillay, P., Nelson-Piercy, C., Tolppanen, H., & Mebazaa, A. (2016). Physiological changes in pregnancy. Cardiovasc J Afr, 27(2), 89-94. https://doi.org/10.5830/cvja-2016-021
South Australia Health. South Australian Perinatal Practice Guideline Bladder Management for Intrapartum and Postnatal Women. https://www.sahealth.sa.gov.au/wps/wcm/connect/a013c0804ee55f67a91cadd150ce4f37/Bladder+Management+for+Intrapartum+and+Postnatal+Women_PPG_v4_0.pdf?MOD=AJPERES&
Tkachenko, O., Shchekochikhin, D., & Schrier, R. W. (2014). Hormones and hemodynamics in pregnancy. Int J Endocrinol Metab, 12(2), e14098. https://doi.org/10.5812/ijem.14098
Need Immediate Help?
If you or someone you know is struggling during the postnatal period, it’s crucial to remember that immediate help is available. Here are steps and resources you can turn to:
In Urgent Situations:
Support Services:
Remember, you are not alone, and reaching out for help is a step toward healing. Your well-being is important, and support is just a phone call away.