What Are the Obvious Symptoms in Early Twin Pregnancy?
Jul 12, 2021
Source: Cainiu Health
Dr. Liu Xiuyan
Introduction
1. Increased abdominal size: The uterus must provide sufficient space for two fetuses to move, resulting in a more pronounced abdominal enlargement during early twin pregnancy compared to singleton pregnancy.
2. More severe early pregnancy symptoms: After conception, women may experience dizziness, fatigue, excessive sleepiness, cold intolerance, and loss of appetite—common early pregnancy symptoms—which tend to be more intense in twin pregnancies.
3. Elevated progesterone levels: Progesterone (and hCG) levels are significantly higher in twin pregnancies than in singleton pregnancies.
Generally, women carrying twins initially appear relatively normal, though they often experience greater fatigue and dizziness compared to singleton pregnancies. As gestation progresses, the mother’s abdomen gradually changes in size and shape. Typically, the abdomen of a twin pregnancy is larger and more prominently distended than that of a singleton pregnancy. So, what are the noticeable early symptoms of twin pregnancy? Below, we address this question.
Noticeable Early Symptoms of Twin Pregnancy
1. Larger Abdomen
Because the uterus must accommodate two fetuses, abdominal enlargement occurs earlier and progresses more rapidly in twin pregnancies—often exceeding the expected size for gestational age, especially after 24 weeks. An abnormally rapid uterine growth relative to the estimated due date may suggest multiple gestation. However, other potential causes of an enlarged uterus include miscalculation of the due date, polyhydramnios (excess amniotic fluid), or uterine fibroids. Therefore, prenatal examinations—particularly for women suspected of carrying twins—are essential.
2. More Severe Morning Sickness
Early pregnancy symptoms—including dizziness, fatigue, excessive sleepiness, chills, and loss of appetite—are typically more pronounced in twin pregnancies. Women may experience varying degrees of nausea, food aversions, and recurrent vomiting. In late pregnancy, symptoms of compression—such as palpitations, shortness of breath, lower-limb edema, and varicose veins—may also occur more frequently. Persistent dizziness and fatigue during pregnancy warrant medical evaluation, as these may indicate a twin pregnancy.
3. Elevated Progesterone Levels
In twin pregnancies, maternal progesterone and human chorionic gonadotropin (hCG) levels are significantly higher than in singleton pregnancies. For example, at seven weeks’ gestation, the normal progesterone range is 52.7–100.1 nmol/L; in twin pregnancies, levels may exceed this range. These hormonal values cannot be self-assessed and require clinical testing during routine prenatal care for accurate interpretation.
The above outlines the prominent early symptoms associated with twin pregnancy. We hope this information is helpful to you.
