A missed abortion is a type of miscarriage where the pregnancy has stopped developing, but the body has not yet expelled the pregnancy tissue. The term sounds alarming, but “abortion” in medical terminology simply means any pregnancy loss, not an elective procedure. You might also hear it called a missed miscarriage or silent miscarriage. It’s typically discovered during a routine ultrasound, often before any obvious signs of a problem appear.
Why It’s Called “Missed”
In most miscarriages, the body recognizes the loss and begins cramping and bleeding to pass the pregnancy tissue. In a missed abortion, that process stalls. The embryo or fetus has no heartbeat, or never developed at all, yet the placenta may continue producing enough hormones to maintain pregnancy symptoms for weeks. The tissue stays in the uterus for at least four weeks after the pregnancy stops developing, sometimes longer.
This is what makes it “silent.” Many people still feel pregnant. Nausea, breast tenderness, and fatigue may persist, though these symptoms sometimes gradually fade. There’s usually no heavy bleeding. Some people notice dark brown spotting, but many have no bleeding at all until the loss is found on ultrasound.
How It Differs From Other Types of Miscarriage
A threatened miscarriage involves vaginal bleeding before 20 weeks, but the cervix remains closed and the fetal heartbeat is still present. The pregnancy may or may not continue. An incomplete miscarriage means some pregnancy tissue has already passed from the uterus, but some remains inside. A missed abortion is distinct because nothing has passed. The pregnancy has ended, but the body shows little outward evidence of it.
How It’s Diagnosed
Ultrasound is the primary tool. Doctors look for specific measurements before confirming a missed abortion, because diagnosing too early risks a false positive, meaning calling a viable pregnancy a loss.
The key thresholds involve two measurements. If an embryo measures at least 7 mm from head to rump and shows no heartbeat, the loss is confirmed. If the gestational sac (the fluid-filled structure that develops before the embryo is visible) reaches 25 mm in diameter with no embryo inside, that also confirms the diagnosis. Earlier research used smaller cutoffs of 5 mm for the embryo and 16 mm for the sac, but those carried false-positive rates of roughly 4 to 8 percent. The larger cutoffs were adopted to eliminate the chance of misdiagnosis.
When measurements fall below those thresholds, doctors typically schedule a follow-up ultrasound seven or more days later. If a gestational sac that was empty on the first scan still shows no embryo on the second, that’s always associated with pregnancy loss.
What Causes It
About half of all early miscarriages, including missed abortions, are caused by chromosomal abnormalities in the embryo. These are random errors that happen when cells divide during the earliest stages of development, resulting in extra or missing chromosomes that make the pregnancy nonviable. In roughly 5 percent of couples who experience recurrent miscarriages, a structural chromosome rearrangement carried by one parent (called a balanced translocation) is responsible.
Other contributing factors can include hormonal imbalances, blood clotting disorders, uterine abnormalities, and certain infections. In many individual cases, though, no specific cause is ever identified. A missed abortion is not caused by exercise, stress, sex, or anything the pregnant person did or didn’t do.
Symptoms to Watch For
Because the hallmark of a missed abortion is the absence of symptoms, there’s no reliable way to detect one at home. Some people notice that pregnancy symptoms like nausea and breast tenderness start to fade. Others experience light brown spotting. But plenty of healthy pregnancies also see symptoms ease around the end of the first trimester, so fading symptoms alone aren’t diagnostic.
Most missed abortions are discovered at a scheduled prenatal ultrasound, which is one reason early ultrasounds are a standard part of prenatal care.
Treatment Options
Once a missed abortion is confirmed, there are three main approaches. The choice depends on how far along the pregnancy was, your health, and your personal preference.
Expectant Management
This means waiting for the body to recognize the loss and pass the tissue on its own. It can take several weeks, and the process involves cramping and heavy bleeding when it begins. Expectant management is less predictable than other options, and some people ultimately need medical or surgical intervention if the tissue doesn’t pass completely.
Medication
Medication can prompt the uterus to contract and expel the pregnancy tissue, usually within a day or two. It causes cramping and bleeding that’s heavier than a normal period, often with clots. This approach avoids a procedure and can be done at home, though a follow-up appointment confirms that all tissue has passed.
Surgical Procedure
Two types of procedures are commonly used. Dilation and curettage (D&C) involves dilating the cervix and using instruments to remove the tissue, typically under anesthesia. Manual vacuum aspiration (MVA) uses gentle suction and can often be done with local pain relief rather than full anesthesia. In a comparative study of 200 women, MVA took roughly half the time of a D&C (about 8 minutes versus 15 minutes), involved less blood loss, and had fewer complications overall, including a lower risk of uterine perforation. Both methods are equally effective at completely emptying the uterus.
Physical Recovery and Fertility
After a missed abortion resolves, whether naturally or through treatment, the body begins returning to its pre-pregnancy state fairly quickly. Ovulation can resume as soon as two weeks after a first-trimester loss. Most people get their first period within four to six weeks, though it can take several months for cycles to fully regulate.
A single missed abortion does not typically affect future fertility. Most people who experience one go on to have healthy pregnancies afterward. If you experience two or more consecutive losses, testing for underlying causes like chromosomal translocations or clotting disorders may be recommended.
The Emotional Side
A missed abortion can be especially difficult emotionally because of the disconnect between feeling pregnant and learning the pregnancy has ended. Many people describe feeling blindsided at what they expected to be a routine ultrasound. Grief, guilt, anger, and numbness are all normal responses, and they don’t follow a set timeline. The loss is real regardless of how early it occurred, and support from partners, loved ones, or a counselor experienced in pregnancy loss can make a meaningful difference in processing it.