What Are Common Causes of Bleeding in the First Trimester of Pregnancy?

…..There are a few common causes of bleeding in the first trimester:What Are Common Causes of Bleeding in the First Trimester of Pregnancy

  • Spontaneous abortion
  • Ectopic pregnancy
  • Subchorionic hemorrhage
  • Gestational trophoblastic disease (less common)

…..When we speak about miscarriages (spontaneous abortions), there are a few terms which are frequently used.  An ultrasound and an examination will usually confirm the diagnosis:

  • Threatened abortion (when vaginal bleeding occurs before 20 weeks of gestation, there is a viable pregnancy, and the woman has a closed cervix)
  • Inevitable abortion (if there is a dilated cervix)
  • Incomplete abortion (when a portion of the pregnancy has passed)
  • Complete abortion (when all of the pregnancy tissue (products of conception) has passed)

…..Gestational trophoblastic disease is a much less common cause of vaginal bleeding early in a pregnancy.  Some signs of this condition would be a pregnancy size larger than would be expected (based on routine dates), very high levels in a blood pregnancy hormone test (hCG), and severe nausea and vomiting.  Here are some common terms that are encountered:

  • Complete hydatidiform mole: A partial mole is formed when a sperm fertilizes an egg that has no nucleus.  This is the most common type of this condition.  On a sonogram, there may be many ovarian cysts seen or many cysts within the uterus.
  • Partial mole: This arises when two sperm fertilize an egg.  On a sonogram, there may be a sac with a fetus.

-Dr. P

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