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Molar pregnancy Symptoms and causes

Molar Pregnancy
Molar pregnancy, also known as hydatidiform mole, is a rare type of pregnancy in which the fertilized egg develops into an abnormal growth instead of a normal fetus. This type of pregnancy occurs when an egg with no genetic material or an egg that has been fertilized by two sperm develops into a mass of abnormal tissue.
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A molar pregnancy, also known as a hydatidiform mole, is a rare and abnormal type of pregnancy in which a non-viable fertilized egg implants in the uterus and grows. This condition is characterized by a collection of cells that turn into an abnormal mass instead of a healthy embryo. A molar pregnancy can have specific symptoms and is usually caused by genetic abnormalities during conception.

Symptoms of Molar Pregnancy: Molar pregnancy often presents with several noticeable signs and symptoms. One of the most common symptoms is vaginal bleeding, which can range from light spotting to heavy bleeding. Additionally, women with molar pregnancies may experience severe nausea and vomiting, often referred to as severe emesis gravidarum. This severe morning sickness can lead to dehydration and weight loss. Other symptoms may include an enlarged uterus larger than expected for gestational age, high blood pressure (preeclampsia), and the presence of grape-like cysts in the uterus, which are sometimes detectable on ultrasound.

Causes of molar pregnancy: A molar pregnancy occurs when there is a problem in the fertilization process that results in an abnormal genetic makeup of the developing fetus. There are two main types of molar pregnancy:

  • Complete molar pregnancy: In this type of egg, there is no maternal genetic material and it is fertilized either by one sperm with repeated genetic material or by two sperm. As a result, the embryo does not develop normally and forms a mass of abnormal tissue.
  • Partial molar pregnancy: In a partial molar pregnancy, two sperm fertilize an egg with an abnormal amount of the mother’s genetic material. This results in some fetal tissue, but is usually intolerable and associated with significant malformations.

A molar pregnancy is usually diagnosed through ultrasound imaging and confirmed by examining tissue samples from the uterus. Treatment usually involves a surgical procedure called dilation and curettage (D&C) to remove the abnormal tissue. After treatment, careful monitoring and follow-up are necessary, as there is a small risk of complications, including the development of gestational trophoblastic neoplasia (GTN), a type of cancer that can occur after a molar pregnancy. Most women who have had a molar pregnancy can have a healthy pregnancy in the future, but working closely with a healthcare provider is important to ensure proper management and follow-up care.

Molar pregnancy can be a rare occurrence for parents, but it does occur in some cases and can be treated with early diagnosis and treatment. Molar pregnancy can be complete or partial. In this type of full pregnancy, there is no embryo and the abnormal tissue is completely composed of placental cells. In this partial pregnancy, there may be some fetal tissue along with the abnormal tissue.

What are the types of molar pregnancies?

There are two types of  molar pregnancies: complete and partial.

  1. Complete molar pregnancy: In this type, the fertilized egg has no genetic material from the mother and turns into a tumor-like growth consisting of abnormal placental tissue. There is no embryo in this type of full pregnancy.
  2. Partial molar pregnancy: The fertilized egg has an extra set of chromosomes from the mother or father. This leads to abnormal placentation and fetal tissue that may be present in the uterus. However, the embryo is not alive and cannot survive.

Both types of molar pregnancies can cause symptoms such as vaginal bleeding, severe nausea and vomiting, abdominal swelling, and high blood pressure. It is important to seek medical attention if you experience any symptoms or have concerns about your pregnancy. Molar pregnancies are rare, but they can be potentially life-threatening if not treated promptly.

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Who is likely to have a molar pregnancy?

Who is likely to have a molar pregnancy?

This type of pregnancy is a rare disease that can occur in any woman who becomes pregnant. However, there are factors that may increase the likelihood of this pregnancy:

  1. Age: Women under 20 or over 40 are more at risk.
  2. Previous molar pregnancy: Women who have had this type of pregnancy in the past are at greater risk in the future.
  3. Family history: Women with a family history may be at higher risk.
  4. Nutritional deficiencies: Women who are deficient in certain nutrients, such as folic acid, may be at increased risk.
  5. History of miscarriage: Women who have a history of miscarriage may be at a slightly higher risk of having a molar pregnancy.

What are the symptoms of a molar pregnancy?

This type of pregnancy can cause a wide range of symptoms, some of which may be similar to normal pregnancy symptoms. However, it can cause unique symptoms that may indicate a problem. Some common symptoms include:

  1. Vaginal bleeding: This is the most common symptom of molar pregnancy and may occur at any time of pregnancy, but most often in the first trimester. Bleeding may be light or heavy and may be accompanied by the passage of grape-like cysts.
  2. Severe nausea and vomiting: This is another common symptom of molar pregnancy and may be more severe than what is typically experienced during a normal pregnancy.
  3. Abdominal swelling: The uterus may become larger than expected during a molar pregnancy, causing abdominal swelling.
  4. High blood pressure: This type of pregnancy can cause high blood pressure, which can be a sign of a more serious condition called preeclampsia.
  5. Hyperthyroidism: Some women with molar pregnancy may develop hyperthyroidism, which can cause symptoms such as weight loss, tremors, and palpitations.


Molar pregnancy is a type of pregnancy that results from genetic errors occurring during fertilization. Normally, during pregnancy, the fetus receives 23 chromosomes from each parent, for a total of 46 chromosomes, which contain genetic information in the form of genes that instruct the body on how to function.

The exact cause of this pregnancy is not fully known. However, it is believed to occur when there is something wrong with the genetic material of the fertilized egg. Normally, the egg is fertilized by a sperm and the resulting embryo contains genetic material from both the mother and the father. There may be an abnormal number of chromosomes, or the egg may be fertilized by two sperm, resulting in an imbalance of genetic material.

There are two types of molar pregnancy, complete and partial. In total, there is no embryo or viable placental tissue, and the pregnancy consists entirely of abnormal placental tissue. In partial, there may be some fetal tissue with abnormal placental tissue.

It is important to seek medical attention if you have any concerns about your pregnancy or are experiencing symptoms such as  vaginal bleeding , severe nausea and vomiting, abdominal swelling, or high blood pressure.


Molar pregnancy is usually diagnosed through a combination of physical exams, ultrasound, and blood tests.

  1. Physical exam: Your healthcare provider will perform a physical exam to check for signs of this type of pregnancy, such as an enlarged uterus or vaginal cysts.
  2. Ultrasound: An ultrasound uses high-frequency sound waves to create images of the inside of the uterus. In a molar pregnancy, the ultrasound may show a cluster of cysts within the uterus, rather than a normal fetus and placenta.
  3. Blood tests: Your healthcare provider may order blood tests to measure the levels of certain hormones, such as human chorionic gonadotropin (hCG). In this pregnancy, hCG levels may be higher than normal.

If this pregnancy is suspected, more tests may be needed to confirm the diagnosis and determine its type. In some cases, a biopsy or genetic testing may be done on the abnormal tissue to confirm the diagnosis.


The treatment for molar pregnancy usually involves surgically removing the abnormal tissue through a procedure called dilation and curettage (D&C). During a D&C, the cervix is dilated and the abnormal tissue is gently scraped out of the uterus. The tissue is then sent to a laboratory for further testing to confirm the diagnosis and to check for any signs of cancer.

After a D&C, your healthcare provider will monitor your hCG levels to ensure that all of the abnormal tissue has been removed. If hCG levels remain high, it may indicate that some tissue was left behind and additional treatment may be necessary.

In rare cases, molar pregnancy can develop into gestational trophoblastic neoplasia (GTN), which is a type of cancer. If this occurs, additional treatment, such as chemotherapy or radiation therapy, may be necessary.

It is important to follow up with your doctor regularly after treatment to check for signs of recurrence or complications. In most cases, women who have had this type of pregnancy can have healthy pregnancies in the future, although they may be advised to wait a while before trying to conceive again.

Complications molar pregnancy


This type of pregnancy can lead to several complications, including:

  1. Cancer: In rare cases, a molar pregnancy can develop into a type of cancer called gestational trophoblastic neoplasia (GTN). GTN can be treated with chemotherapy or radiation therapy .
  2. Recurrence: Women who have had this pregnancy in the past are at higher risk of having another molar pregnancy in the future.
  3. Preeclampsia: Molar pregnancy can cause high blood pressure and protein in the urine, which are signs of a condition called preeclampsia. Preeclampsia can be a serious condition that requires medical treatment.
  4. Hemorrhage: Molar pregnancy can cause vaginal bleeding, which can be severe and may require medical intervention to stop.
  5. Thyroid problems: Some women with this type of pregnancy may develop hyperthyroidism, which can cause symptoms such as weight loss, tremors, and palpitations.

Prevent this type of pregnancy

Unfortunately, there is no known way to prevent molar pregnancy from occurring. However, there are some steps you can take to promote a healthy pregnancy and reduce your risk of complications:

  1. Attend all prenatal appointments: Regular prenatal care is essential for monitoring the health of both the mother and the developing fetus. Your healthcare provider can also screen for any potential problems and provide treatment if necessary.
  2. Take a prenatal vitamin: Taking a prenatal vitamin that contains folic acid can help reduce the risk of certain birth defects and may also help promote a healthy pregnancy.
  3. Maintain a healthy lifestyle: Eating a healthy, balanced diet, getting regular exercise, and avoiding alcohol and tobacco can help promote a healthy pregnancy.
  4. Seek medical attention for symptoms: If you experience any symptoms such as vaginal bleeding, severe nausea and vomiting, abdominal swelling, or high blood pressure, it is important to seek medical attention right away.

While it is not possible to prevent molar pregnancy, early diagnosis and treatment are critical for preventing complications and ensuring the best possible outcome.

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4 Responses

  1. Will a molar pregnancy affect my chances of having a healthy pregnancy in the future?

    1. Having a molar pregnancy does not necessarily mean that you will face problems in subsequent pregnancies. In most cases, women who have had a molar pregnancy can have a healthy pregnancy. However, it is important to work closely with the health care provider to ensure appropriate management and follow-up care. After a molar pregnancy, it is recommended to wait for some time (usually 6-12 months) before trying to get pregnant again. This allows your body to heal and reduces the risk of complications.Your healthcare provider will monitor your hCG (human chorionic gonadotropin) levels regularly to make sure they return to normal, as high hCG levels may indicate complications such as gestational trophoblastic neoplasia (GTN) that may require treatment. be

    1. The risk of another molar pregnancy in subsequent pregnancies is generally low, especially if the molar pregnancy is a complete molar pregnancy. The probability of reoccurrence of complete molar pregnancy is lower than that of partial molar pregnancy. The risk of recurrence is usually around 1-2%. Your healthcare provider will closely monitor your hCG levels early in your pregnancy to monitor for any possible recurrences. If a recurrent molar pregnancy is suspected, further diagnostic tests and evaluations will be performed. While the risk is relatively low, maintaining regular prenatal care and following your health care provider’s recommendations for close monitoring in future pregnancies is essential.

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