# Preeclampsia in the third trimester

Source: https://www.pregnancypowerhour.com/trimester-conditions/preeclampsia-in-third-trimester
Last updated: 2026-07-15

> Preeclampsia most commonly emerges in the third trimester, often with a rapid onset, and can even develop postpartum, requiring vigilant monitoring and prompt care.

Preeclampsia, sometimes referred to as 'high blood pressure of pregnancy,' is a condition that can arise at various points in pregnancy, but it is most frequently diagnosed in the third trimester. This is a time when your body is working incredibly hard, supporting significant growth and preparing for birth. Understanding what to look for and how to collaborate with your care team can bring calm and clarity during this important window.

## Why it shows up this trimester

While preeclampsia can technically develop after 20 weeks of pregnancy, the third trimester (weeks 28-40) is when it most commonly becomes apparent. As your pregnancy progresses, the demands on your body, particularly your cardiovascular system and kidneys, increase significantly. The placenta, which is central to preeclampsia's development, is also at its largest and most active. For some, the condition might have been subtly developing, and the increased physiological stress of late pregnancy can cause symptoms to become more pronounced or to appear quite suddenly. It's also important to remember that preeclampsia can sometimes emerge in the postpartum period, even after a healthy birth.

## What it tends to feel like now

In the third trimester, symptoms of preeclampsia can sometimes be mistaken for the general discomforts of late pregnancy. However, certain signs warrant closer attention. You might experience a persistent headache that doesn't ease with typical pain relief, or changes in your vision, such as blurriness, seeing spots, or flashing lights. Swelling, particularly in your face or hands, that comes on suddenly and is more than just typical pregnancy puffiness, can be a sign. Some individuals also report pain in the upper right side of the abdomen, just under the ribs, or shoulder pain. Rapid, unexplained weight gain can also be a signal. It's about noticing new or worsening symptoms and communicating them clearly.

## What helps in this window

While preeclampsia requires medical management from your care provider, there are supportive measures you can take to nurture your well-being. Prioritizing rest is incredibly important; listen to your body and take breaks when you need them. Staying well-hydrated can support your overall circulation and kidney function. Practicing gentle relaxation techniques, like deep breathing or guided meditation, can help manage stress and support a calm nervous system, which is beneficial for your overall health. These are complementary steps to your medical care, helping you feel more grounded.

## Working with your care team

Open and consistent communication with your OB or midwife is absolutely key if preeclampsia is a concern. They will likely recommend more frequent monitoring of your blood pressure, urine protein levels, and possibly blood tests to check liver and kidney function. You get to decide how to best engage with this monitoring, and your care team can help you understand the purpose of each test. Ask questions, express any concerns, and work collaboratively to create a clear plan for managing your health and the well-being of your baby. Your provider is your best resource for your specific situation and will guide you through evidence-based options for care.