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Causes of Polyhydramnios

There are a number of causes of polyhydramnios. In general, polyhydramnios means either too much amniotic fluid is being produced or not enough of it is being absorbed—or both. While the cause of polyhydramnios is not always known, risk factors include:

  • Poorly controlled maternal diabetes
  • Fetal gastrointestinal abnormalities
  • Fetal lung disorders
  • Multiple pregnancy
  • Difficulty swallowing due to central nervous system problems
  • Twin-to-twin transfusion syndrome
  • Heart failure
  • Pregnancy-acquired congenital infection
  • Beckwith-Wiedman syndrome (an overgrowth birth disorder)
  • Achondroplasia (a common cause of dwarfism)
  • Hydrops fetalis (the accumulation of fluid in two fetal compartments)

Locations for Polyhydramnios