Toxemia is an older term for what doctors now call preeclampsia, a pregnancy complication involving dangerously high blood pressure and, often, excess protein in the urine. It affects 2 to 8 percent of all pregnancies and typically develops in the last few months, though it can also appear after delivery. The term “toxemia of pregnancy” is still listed as a medical synonym for preeclampsia, but you’ll rarely hear modern providers use it.
Why the Name Changed
Doctors once believed the condition was caused by toxins circulating in a pregnant woman’s blood, which is where the name “toxemia” came from. As understanding improved, the medical community shifted to “preeclampsia” (meaning before eclampsia, or seizures) because it more accurately describes the condition’s progression. You may still encounter “toxemia” in older medical records, family conversations, or some international health systems, but it refers to the same condition.
What Causes It
Preeclampsia traces back to a problem with how the placenta connects to the uterine blood supply. Early in a normal pregnancy, the small spiral-shaped arteries in the uterus remodel themselves, widening from narrow, high-resistance vessels into relaxed, open ones that deliver large volumes of blood to the growing placenta. In preeclampsia, this remodeling is incomplete. The arteries stay too narrow, restricting blood flow to the placenta and triggering a cascade of problems that eventually raise the mother’s blood pressure and damage her blood vessels.
This faulty remodeling is especially common in early-onset preeclampsia, which tends to be more severe. The restricted blood flow can also limit how much oxygen and nutrition reach the baby, sometimes leading to growth restriction or the need for early delivery.
Who Is Most at Risk
Several factors raise the likelihood of developing preeclampsia. Having chronic high blood pressure, diabetes, or kidney disease before pregnancy are among the strongest risk factors. Obesity, a high BMI, and advanced maternal age also increase risk, as does carrying twins or other multiples. Women pregnant for the first time face higher odds than those who have had uncomplicated pregnancies before.
A family history of preeclampsia, autoimmune conditions like lupus, and pregnancies conceived through assisted reproduction are additional risk factors. Racial and ethnic disparities are significant: preeclampsia is most prevalent among Black and Hispanic patients in the United States, contributing to roughly 26 percent of maternal deaths in these populations. Maternal mortality from the condition is also higher among women with lower incomes and less education.
Symptoms and Warning Signs
Preeclampsia often begins silently. High blood pressure may be the only early sign, which is one reason prenatal blood pressure checks are so important. As the condition progresses, more noticeable symptoms can develop:
- Severe headaches that don’t respond to typical pain relief
- Vision changes including blurred vision, light sensitivity, or temporary vision loss
- Upper belly pain, usually under the ribs on the right side
- Nausea or vomiting that appears later in pregnancy
- Shortness of breath from fluid building up in the lungs
- Sudden swelling of the face and hands, or rapid weight gain beyond what’s normal in pregnancy
Some swelling and weight gain are completely normal during pregnancy. What distinguishes preeclampsia-related swelling is how suddenly it appears, particularly in the face and hands rather than just the feet and ankles. Mental confusion or altered behavior can also occur and may signal that seizures (eclampsia) are imminent.
How It’s Diagnosed
A blood pressure reading of 140/90 mm Hg or higher during pregnancy raises suspicion. If protein also shows up in a urine test, the diagnosis becomes more clear. Additional blood tests check for signs of organ stress, including liver and kidney function and platelet counts. These tests help determine whether the condition is progressing toward more dangerous territory.
HELLP Syndrome: A Severe Complication
HELLP syndrome is a life-threatening variant of severe preeclampsia. The name stands for three things happening at once: red blood cells breaking apart (hemolysis), elevated liver enzymes indicating liver damage, and a dangerously low platelet count that impairs blood clotting. Women with HELLP may experience intense upper abdominal pain, nausea, vomiting, fatigue, and jaundice. Serious complications can include placental separation from the uterine wall, kidney injury, or bleeding in the liver. It requires emergency medical treatment.
Treatment and Delivery
The only cure for preeclampsia is delivering the baby and the placenta. When the condition develops close to the due date, this is straightforward. When it appears earlier, doctors face a difficult balancing act between giving the baby more time to develop and protecting the mother from worsening complications.
While managing the condition before delivery, medications are used to lower blood pressure and prevent seizures. Magnesium sulfate is the standard medication for seizure prevention in women with severe features, and it’s typically continued for 24 hours after delivery. Blood pressure medications help reduce the immediate danger of stroke, but they don’t treat the underlying disease. Only delivery does that.
Postpartum Preeclampsia
Preeclampsia doesn’t always end with delivery. Most postpartum cases develop within 48 hours of childbirth, but the condition can appear up to six weeks later (called late postpartum preeclampsia). The symptoms mirror those during pregnancy: high blood pressure, headaches, vision changes, upper belly pain, and decreased urination. This is why new mothers who experience these symptoms in the weeks following birth should take them seriously, even if their pregnancy itself was uncomplicated.
Long-Term Health Effects
A history of preeclampsia carries significant cardiovascular consequences that can last decades. Women who have had the condition face a two- to fourfold increased risk of developing chronic high blood pressure, heart disease, stroke, heart failure, and peripheral artery disease later in life. About half of women with a history of preeclampsia develop chronic hypertension within 5 to 15 years after their pregnancy.
This elevated risk can show up as early as 5 to 10 years postpartum and persists long after. Even in the absence of obvious heart disease, women with a preeclampsia history show markers of hidden cardiovascular damage, including stiffer arteries and early signs of plaque buildup. The risk is highest for women who had severe or recurrent preeclampsia, or who delivered preterm because of it. For these women, proactive cardiovascular screening in the years that follow can catch problems early.