What causes a pulsating sensation in the abdomen during the late stages of pregnancy at night?

Generally, a pulsating sensation in the abdomen during the third trimester of pregnancy at night may be caused by fetal hiccups, active fetal movement, false labor contractions (Braxton Hicks contractions), uterine ligament stretching, or preterm labor. If discomfort occurs, it is recommended to seek timely medical evaluation and treatment at a正规 hospital. Specific causes are analyzed as follows:

1. Fetal Hiccups

When the fetus swallows amniotic fluid to practice lung function, it can cause spasms of the diaphragm, resulting in a rhythmic pulsating sensation. Changing body position—such as lying on the side or sitting up—and gently stroking the abdomen usually helps relieve the sensation within a few minutes.

2. Active Fetal Movement

At night, when the mother is quiet and relaxed, the fetus is more likely to be awake and active, leading to increased movements that may feel like abdominal pulsations. Staying emotionally relaxed, playing soft music, avoiding late nights, and adapting to the baby’s activity patterns can help.

3. False Labor Contractions (Braxton Hicks Contractions)

In late pregnancy, the uterus becomes more sensitive and may experience irregular contractions at night, causing the abdomen to feel tight or pulsate. Stop any activity immediately, rest in bed, and avoid touching or stimulating the abdomen. These contractions typically resolve on their own.

4. Uterine Ligament Stretching

As the uterus enlarges, it stretches surrounding ligaments. This pulling sensation may become more noticeable at night when body position remains fixed, occasionally causing a pulsating discomfort. Adjust sleeping posture by lying on the left side and placing a soft pillow under the waist to reduce strain on the ligaments.

5. Preterm Labor

Rhythmic uterine contractions may cause a pulsating feeling, often accompanied by pelvic pressure or lower back pain, which could indicate preterm labor. Seek immediate medical attention. Under a doctor’s guidance, medications such as ritodrine tablets, atosiban injection, or progesterone capsules may be used to suppress contractions. If necessary, measures for preserving the pregnancy should be taken.

In daily life, pregnant women should monitor fetal movements and contractions; avoid strenuous exercise and overexertion; maintain a balanced diet and avoid irritating foods; attend regular prenatal checkups; and follow medical advice for proper care during the third trimester.