What causes buttock pain during the fourth month of pregnancy?

Nov 15, 2025 Source: Cainiu Health

Dr. Zhang Lu

Introduction

In general, buttock pain during the fourth month of pregnancy may be caused by uterine compression of the sciatic nerve, hormonal changes leading to ligament laxity, sciatica, piriformis syndrome, or sacroiliac joint inflammation. If the pain persists or worsens, it is advisable to seek timely medical evaluation at a reputable hospital. In daily life, choose comfortable flat shoes and avoid strenuous exercise; maintain reasonable weight gain to reduce pelvic strain.

Generally, buttock pain during the fourth month of pregnancy may be caused by uterine compression of the sciatic nerve, hormonal changes leading to ligament laxity, sciatica, piriformis syndrome, sacroiliac joint arthritis, and other reasons. If the pain persists or worsens, it is recommended to seek timely medical evaluation at a正规 hospital. Specific analyses are as follows:

1. Uterine Compression of the Sciatic Nerve

As the uterus enlarges, it may compress the sciatic nerve within the pelvic cavity, disrupting nerve conduction and causing buttock pain, which becomes more noticeable after prolonged sitting. Adjust sitting posture to avoid long periods of sitting, use soft cushions, stand up regularly to move around, and adopt a side-lying position during sleep to reduce pressure.

2. Hormonal Changes Leading to Ligament Laxity

Pregnancy-related hormonal fluctuations cause relaxation of ligaments around the pelvis to accommodate fetal development, reducing ligament stability and triggering pain. Avoid prolonged standing or walking, perform gentle stretching exercises for pelvic muscles, and supplement with calcium and vitamin D.

3. Sciatica

Inflammation or compression of the sciatic nerve causes radiating pain in the buttocks and lower limbs. Under medical guidance, neurotrophic medications such as vitamin B1 tablets, mecobalamin tablets, and folic acid tablets may be taken, along with gentle massage to relieve discomfort.

4. Piriformis Syndrome

Tension or spasm of the piriformis muscle compresses the sciatic nerve, resulting in buttock pain. Under medical supervision, topical application of diclofenac sodium gel may be used, or oral medications such as eperisone hydrochloride tablets or chlorzoxazone tablets can help relieve muscle spasms, combined with professional physical therapy.

5. Sacroiliac Joint Arthritis

Compression or inflammatory irritation of the sacroiliac joint leads to deep-seated buttock pain. Under medical guidance, medications such as celecoxib capsules, etoricoxib tablets, or glucosamine sulfate capsules may be prescribed. In severe cases, sacroiliac joint fusion surgery may be considered.

In daily life, choose comfortable flat shoes and avoid strenuous exercise; maintain reasonable weight gain to reduce pelvic strain; engage in prenatal yoga appropriately to strengthen muscles; and attend regular prenatal checkups, promptly reporting any physical discomfort.

View All

What does it mean when HCG levels are higher than expected for the gestational age?

In general, higher-than-expected HCG levels for gestational age may be caused by errors in estimating gestational age, twin or multiple pregnancies, molar pregnancy, gestational diabetes, or ovarian theca-lutein cysts. If any discomfort occurs, it is recommended to seek timely medical evaluation and treatment at a正规 hospital. In daily life, keeping a record of menstrual cycles can help accurately estimate gestational age, and maintaining a balanced diet during pregnancy is important.

View Full Answer

What does it mean if the gestational sac cannot be seen at 42 days of pregnancy?

In general, the absence of a gestational sac at 42 days of pregnancy may be caused by miscalculation of gestational age, delayed embryo implantation, ectopic pregnancy, embryonic arrest, polycystic ovary syndrome (PCOS), or other reasons. If any discomfort occurs, it is recommended to seek timely medical evaluation and treatment at a正规 hospital. In daily life, women should keep track of their menstrual cycles to accurately estimate gestational age, and avoid exposure to harmful substances when trying to conceive or during early pregnancy.

View Full Answer

What does it mean when a pregnant woman has elevated non-squamous epithelial cells?

In general, elevated non-squamous epithelial cells in pregnant women may be caused by hormonal changes, urine contamination, bacterial vaginosis, urethritis, cervical polyps, or other factors. Pregnant women can improve the condition by adjusting their lifestyle or following medical advice according to their individual circumstances. It is important to pay special attention to bodily signals during pregnancy, maintain proper external genital hygiene, wear loose and breathable clothing, drink plenty of water, and avoid holding in urine.

View Full Answer

What causes slight bleeding in the third trimester of pregnancy without abdominal pain, and what should be done?

In late pregnancy, slight bleeding without abdominal pain may be caused by factors such as bloody show, cervical polyps, placenta previa, early placental abruption, or vaginitis. Symptoms can be managed through symptom observation, bed rest, medication, and medical monitoring. If bleeding increases or abdominal pain occurs, immediate medical attention is required. In late pregnancy, the cervix matures, and the fetal membranes near the internal cervical os may separate from the uterine wall.