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NANDISH blog

Back pain in pregnancy

19/7/2021

 
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A range of natural biological changes take place in a woman’s body during pregnancy, which directly affects the musculoskeletal system and may become a potential cause of back pain and related issues, such as leg pain.

Pregnancy-related changes typically involve the joints and connective tissues, making them loose, pliable and soft. These changes result in increased stress and strain on the spinal and pelvic joints in the lower back and hips. Back pain may develop as early as the first trimester and typically increases as pregnancy continues.
The pain can vary from intermittently minor discomfort, to chronic and debilitating. The pain may originate in the mid and/or lower back area and typically includes the pelvis and hips. The lumbar spine (lower back) and sacroiliac joints are most commonly affected due to changes in posture, joint stability, body weight and shape.

While in most cases back pain is self-limiting, resolves after delivery, and does not cause lasting issues, some women may continue to be affected by pain in the lumbar and/or pelvic region for several months or years. In general, women who receive postural and activity-related counseling during pregnancy are less likely to develop severe back pain symptoms.

This article describes the causes and types of pregnancy-related lower back pain in detail, including insights on treatment options and the occurrence of back pain after birth.

Typical Features of Lower Back Pain in Pregnancy

Back pain affects over 50% of pregnant women. While it can occur at any time during pregnancy, back pain is usually most troublesome during the second and third trimesters. Pregnancy-related symptoms and signs affecting the lower back typically result in reduced overall function and include (but are not limited to):
  • Pain of varying intensity that starts or flares during movement or activity, such as while sitting, standing, walking, lifting objects, sexual intercourse, bending and/or twisting the spin
  • Sleep disturbances due to pain while turning in bed, lack of sleep and reduced sleep hours
  • Reduced range of motion in the lower back (lumbar spine)
  • Changes in balance and walking patterns, especially in the second and third trimesters
These changes mostly occur due to the shift in the center of gravity towards the abdomen. This shift increases the curve of the lower spine and causes a slight backward tilt of the sacrum (part of the spine that connects the lower back to the hip).

The effect of activity and weight on back pain. While pregnant women who lead a sedentary lifestyle may be at a higher risk of developing back pain, engaging in heavy physical labor or being active through the day may also lead to back pain symptoms in pregnancy.

Limited research indicates that women with increased body mass index (BMI) may be at a higher risk of developing back pain while pregnant.
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Average Duration of Lower Back Pain in Pregnancy

Research indicates that over half the population of pregnant women experience pain in the lower back and/or pelvic region lasting more than 3 months, typically during the second and/or third trimester.

  • A small percentage of women may experience pain as early as 4 to 16 weeks.
  • The fifth to seventh month period typically has the highest reports for pregnancy-related back pain.
  • Up to 10% of women may have pain through all the 3 trimesters of pregnancy.
Back pain that continues after delivery is called postpartum back pain. About 72% of women continue to experience postpartum pain in the lower back and pelvis up to 1 year after delivery, which may extend up to several years in some cases.

When Back Pain Is an Early Sign of Pregnancy

Since only a fraction of women develop back pain during the very early stages of pregnancy, the symptom is not usually identifiable as a sole or significant indicator of gestation. When back pain is accompanied by other symptoms and signs, such as a missed period, morning sickness, constant nausea, fatigue and/or body soreness, it may indicate early pregnancy

How Pregnancy-Related Changes May Cause Back Pain

Women usually gain between 20lb to 25lb (on average) during pregnancy, have a shift in their point of gravity and undergo several hormonal and anatomical changes. These natural alterations increase stresses and loads on the lower spine and pelvis, contributing to the following changes:

  • Modifications in posture. The growing uterus and increased curvature of the lower spine exert additional mechanical loads on the lower back, altering the spinal posture. This altered posture increases stress on the lumbar facet joints and lumbar spinal discs. Pelvic rotation occurs at the second sacral segment (S2-S3), which increases as the curve in the lumbar spine becomes more pronounced.
  • Changes in muscle tone and balance. The paraspinal muscles, which support and stabilize the lower back, shorten, and become unbalanced by the excessive stretching of the abdominal muscles in the front.
  • Discomfort in the sacroiliac joints. A 10-fold increase in the concentration of the relaxin hormone during pregnancy causes softening of connective tissue in the pelvis and lower back, which leads to discomfort in the sacroiliac joints.
  • Stress on the pelvic joint. The pelvis is a stabilizing structure in the lower body that transfers loads from the upper body to the legs. Hormonal changes, alterations in posture and walking pattern and stress on ligament structures may cause increased forces across the pelvic joints in pregnant women. Pregnancy-related changes cause an impaired load transfer during activities, which may result in an overload of stress on the ligaments of the pelvis.
  • Pressure on the spinal discs. While rare, about one in 10,000 (less than 1%) pregnant women may develop a herniated disc in the lumbar spine due to increased stresses on the disc(s) from the concurrent bodily changes. A herniated disc may in turn irritate, inflame, or mechanically compress a spinal nerve root in the lower back, causing sciatica symptoms to radiate into the thigh, leg and/or foot.
  • Transient osteoporosis. Weigh-bearing, especially in the third trimester, may cause some women to develop transient osteoporosis. This bone-weakening condition develops suddenly and causes hip pain and reduced range of motion in the hips.
Previously existing lower back conditions, such as idiopathic scoliosis, rheumatoid arthritis, and ankylosing spondylitis, may worsen in pregnancy, increasing pain and other symptoms. Also, women who are younger, are of advanced maternal age, or have a history of lower back pain during menstruation may be at a higher risk of developing back pain in pregnancy
Regular visits to a chiropractor during your pregnancy can address these issues. One collaborative chiropractic and medical study revealed that 75 percent of pregnant chiropractic care patients reported pain relief. Plus, adjustments designed to re-establish balance and alignment to your pelvis and spine will do more than just make you feel better. Chiropractic care can be beneficial for your baby, too.
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References

1.Chila AG. Foundations of Osteopathic Medicine. Lippincott Williams & Wilkins; 2010.
2.Silva AM. Preventing and Managing Back Pain During Pregnancy. Expect Fitness; 2004.
3.Sabino J, Grauer JN. Pregnancy and low back pain. Curr Rev Musculoskelet Med. 2008;1(2):137-141. doi:10.1007/s12178-008-9021-8
4.Bergström C, Persson M, Nergård KA, Mogren I. Prevalence and predictors of persistent pelvic girdle pain 12 years postpartum. BMC Musculoskelet Disord. 2017;18(1):399. Published 2017 Sep 16. doi:10.1186/s12891-017-1760-5
5.Yoo H, Shin D, Song C. Changes in the spinal curvature, degree of pain, balance ability, and gait ability according to pregnancy period in pregnant and nonpregnant women. J Phys Ther Sci. 2015;27(1):279-284. doi:10.1589/jpts.27.279
6.Schröder G, Kundt G, Otte M, Wendig D, Schober HC. Impact of pregnancy on back pain and body posture in women. J Phys Ther Sci. 2016;28(4):1199-1207. doi:10.1589/jpts.28.1199
7.Manyozo SD, Nesto T, Bonongwe P, Muula AS. Low back pain during pregnancy: Prevalence, risk factors and association with daily activities among pregnant women in urban Blantyre, Malawi. Malawi Med J. 2019;31(1):71-76. doi:10.4314/mmj.v31i1.12

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    • THE CHIROPRACTIC CLINIC >
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