# Polyhydramnios

Source: https://www.pregnancypowerhour.com/conditions/polyhydramnios
Last updated: 2026-07-15

> Polyhydramnios is when there's an excess amount of amniotic fluid surrounding your baby, often identified in the third trimester, requiring close monitoring.

## What it is

Polyhydramnios is a condition characterized by an excess of amniotic fluid surrounding your baby, often identified in the third trimester, and calls for careful monitoring and a collaborative approach with your care team. This is typically diagnosed via ultrasound when the amniotic fluid index (AFI) measures greater than 24cm or the single deepest pocket (SDP) is more than 8cm.

While it affects a small percentage of pregnancies, understanding what it means can bring clarity. Many mild cases are considered idiopathic, meaning no specific cause is found, and often have positive outcomes. However, moderate to severe cases do warrant a more detailed evaluation to understand any potential underlying factors.

## What it tends to feel like

When there's an increased volume of fluid, you might notice some distinct physical sensations. Many people experience a rapid growth in uterine size, which can sometimes lead to increased abdominal discomfort. You might also find yourself feeling more short of breath, as the expanded uterus can put pressure on your diaphragm. Swelling, or edema, can also be a noticeable symptom, similar to how increased fluid retention can contribute to conditions like [Pregnancy Carpal Tunnel Syndrome](/conditions/carpal-tunnel-pregnancy) for some. These symptoms can naturally lead to a sense of unease or even impact your ability to rest comfortably, much like how [Restless Legs in Pregnancy](/conditions/restless-legs) can disrupt sleep.

It's important to remember that these feelings, while sometimes intense, are your body's way of communicating. Paying attention to them and discussing them with your care team is a vital part of your prenatal journey.

## What the evidence says helps

When polyhydramnios is identified, your care team will typically recommend serial ultrasounds to monitor the fluid levels and your baby's well-being. A detailed fetal anatomy scan is also standard to look for any potential causes. If an underlying cause is found, such as gestational diabetes, managing that condition becomes a key part of your care plan. For instance, just as managing iron levels is crucial for [Iron-Deficiency Anemia in Pregnancy](/conditions/anemia), addressing conditions that contribute to fluid imbalance is important here.

In some situations, medication like Indomethacin might be considered to help reduce fluid volume. However, this is generally avoided after 32 weeks of pregnancy due to potential risks to the baby's heart. Your provider will discuss these options with you, weighing the benefits and considerations for your unique situation.

## Working with your care team

Discovering polyhydramnios can bring a lot of questions, and your care team is your best resource for clear, evidence-based answers. Potential causes can include gestational diabetes, issues with the baby's swallowing reflex, gastrointestinal tract concerns, neural tube defects, or certain viral infections. Sometimes, despite thorough investigation, a clear cause isn't identified, which is known as idiopathic polyhydramnios.

It's helpful to know that polyhydramnios can increase the risk of preterm labor. Additionally, if your membranes rupture, there's an increased risk of cord prolapse, where the umbilical cord might descend before the baby. This is why close monitoring and a clear birth plan discussion with your provider are so valuable. As a doula, I encourage clients to ask questions, understand their options, and feel confident in the decisions they make alongside their medical team. You get to decide what feels right for you and your baby, supported by informed conversations.