Pain in the upper abdomen is often caused by increased gastric acid secretion during early pregnancy. Occasional cramping in the lower abdomen is related to the stretching of ligaments supporting the enlarging uterus. These discomforts typically subside naturally as the first trimester progresses.
2. Uterine Enlargement Compression Pain
Manifests as lower abdominal pain during months 3-4 of pregnancy. During this period, the uterus grows rapidly, compressing surrounding organs and causing lower abdominal discomfort. As pregnancy progresses, uterine compression symptoms gradually improve, and the pain may lessen or disappear entirely.
3. Round ligament pain
Characterized by persistent, dull lower abdominal pain without any apparent trigger during the 5th to 6th month of pregnancy. At this stage, the uterus grows most rapidly. The round ligaments supporting the uterus stretch, lengthen, and increase in tension. The uterine wall where the round ligaments attach is pulled, causing pain.
4.Hiatal Hernia
Manifests as upper abdominal pain during months 4-7 of pregnancy, often accompanied by chest tightness, shortness of breath, chest pain, bloating, acid reflux, and belching.
During this stage, as the uterus enlarges and intra-abdominal pressure increases, approximately 30%-50% of expectant mothers experience widening of the esophageal hiatus, leading to hiatal hernia formation.Compression and spasm of the esophagus cause upper abdominal pain, which may become more pronounced in late pregnancy.
5. Early Contractions
Characterized by occasional abdominal tightness starting around the third month of pregnancy, sometimes accompanied by mild pain. Occurrence is irregular and does not involve vaginal bleeding.These irregular contractions occur as the fetus develops within the uterine cavity. Physical activity, stress, and fatigue may also trigger protective contractions. This is a physiological phenomenon and generally requires no concern.
6. Threatened Miscarriage
Characterized by light vaginal bleeding within the first seven months of pregnancy, often lighter than menstrual flow and typically bright red in color. It may be accompanied by lower abdominal pain, backache, and a sensation of heaviness.
Factors contributing to threatened miscarriage include endocrine dysfunction, infectious diseases, high fever, severe anemia, severe malnutrition, exposure to radiation or toxic substances, reproductive tract abnormalities, and uterine fibroids. Chromosomal abnormalities in the fertilized egg can also cause threatened miscarriage.
7. Placental Abruption
Manifests after the fifth month of pregnancy with sudden heavy vaginal bleeding, persistent abdominal pain of varying intensity, abdominal distension and hardening, and marked tenderness on palpation. Often accompanied by nausea, vomiting, dizziness, and pallor.
8. Ectopic Pregnancy
Most occur within the first three months of pregnancy. Primary symptoms include irregular, scant vaginal bleeding with dark red blood; sudden onset of abdominal pain that progressively worsens, potentially leading to fainting and shock.
9. Molar Pregnancy
Characterized by pronounced pregnancy symptoms, rapid abdominal enlargement, distending pain without fetal movement. Around the third month, irregular vaginal bleeding occurs, accompanied by abdominal pain (mild to severe) and possible discharge of vesicular fluid.
Abdominal pain not caused by pregnancy——
These pains may not be entirely pregnancy-related, but they are often influenced by pregnancy, complicating diagnosis and treatment. Therefore, they warrant particular attention.
10. Acute appendicitis
Initial symptoms include upper abdominal or umbilical pain, vomiting, and occasionally increased bowel movements. Within hours, as inflammation spreads to the peritoneum, pain localizes to the right lower abdomen where the appendix is located.
Acute appendicitis can occur during early, mid, or late pregnancy.The presence of the fetus causes the appendix to gradually migrate upward with increasing gestational age, complicating diagnosis.
11. Intestinal Obstruction
Symptoms include abdominal colic, vomiting, bloating, and cessation of bowel movements and flatus. If the mother underwent abdominal surgery before pregnancy, postoperative intestinal adhesions are often the cause of obstruction during pregnancy.
12. Cholelithiasis and Cholecystitis
Manifest as distending pain in the right upper abdomen, radiating pain to the right shoulder or back, worsening with movement or breathing, and may include fever, chills, nausea, and vomiting.
After conception, elevated cholesterol saturation in maternal blood and bile increases susceptibility to gallstone formation.Cholelithiasis and cholecystitis can occur at any stage of pregnancy but are more common in late pregnancy and the postpartum period.
13. Acute Pancreatitis
Characterized by sudden onset of persistent, severe pain in the upper abdomen, often occurring after a large meal. It is accompanied by fever, nausea, and vomiting. Severe cases may develop peritonitis and shock.
During pregnancy, increased abdominal pressure from uterine enlargement, combined with high-protein and high-fat diets, significantly burdens the digestive system. Elevated pancreatic duct pressure and accumulated fat in the intestines may collectively trigger pancreatitis.
14. Uterine Fibroids
Typically manifest as sudden, localized abdominal pain with a fixed point of discomfort. If pre-existing fibroids enlarge during pregnancy, they may adversely affect gestation—e.g., through degeneration/necrosis, torsion, direct interference with fetal development, or delivery complications.
15. Adnexitis
Symptoms include abdominal pain that is tender to touch, fever, increased vaginal discharge that is yellow and foul-smelling, as well as headaches, loss of appetite, vomiting, diarrhea, frequent urination, and urgency.
16. Gastrointestinal Ulcers
The most common symptom is pain, typically located in the upper abdomen, which may be relieved by eating or taking antacids. The pain is often described as burning, gnawing, or a sensation of hunger. The condition is characterized by a chronic and recurrent course.
17. Urinary Tract Stones
Upper tract stones cause sudden pain in the back or abdomen, often radiating to the lower abdomen, groin, inner thighs, and labia. Lower tract stones present with interrupted or painful urination, pain in the lower abdomen and perineum worsening during the final stages of urination, and may include hematuria.
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