Miscarriage: Symptoms, Causes, Types, Treatment & Prevention

Vaginal bleeding, abdominal cramps or a sudden change in pregnancy symptoms can be worrying, especially during the early weeks of pregnancy. While these signs do not always indicate a miscarriage, they should not be ignored. A miscarriage, also known as pregnancy loss, occurs when a pregnancy ends spontaneously, most commonly during the first trimester. It can happen for several reasons, including chromosomal abnormalities and certain maternal health conditions, although the exact cause is not always clear. Understanding the possible warning signs, causes and available treatment options can help women seek timely medical care and make informed decisions. In this guide, we'll discuss miscarriage symptoms, causes, types, diagnosis, treatment and whether the risk of pregnancy loss can be reduced.

What is a Miscarriage?

A miscarriage is the spontaneous loss of a pregnancy before the stage at which the developing baby can survive outside the uterus. The precise definition varies between medical guidelines, with some using a threshold of 20 weeks and others defining miscarriage as pregnancy loss before 24 weeks.

Most miscarriages occur during the first trimester, particularly within the first 12 to 13 weeks of pregnancy. Pregnancy loss during the second trimester is less common but may occur because of different underlying medical or pregnancy-related conditions.

Miscarriage is sometimes called spontaneous abortion in medical terminology. This refers to a pregnancy ending naturally, not an intentionally induced termination.

According to the American College of Obstetricians and Gynecologists (ACOG), approximately 10 in every 100 known pregnancies end in early pregnancy loss. The actual number may be higher because some losses occur before a woman realises she is pregnant.

What are the Common Symptoms of Miscarriage?

Miscarriage symptoms can vary depending on the stage of pregnancy and whether the pregnancy loss is complete or still in progress.

Some women experience obvious symptoms, while others have no noticeable changes and discover the loss during a routine ultrasound.

Common symptoms include:

• Vaginal bleeding: Light spotting, brownish discharge or heavier bleeding that may contain blood clots.
• Abdominal cramping: Pain or cramps in the lower abdomen, sometimes more intense than menstrual cramps.
• Lower back pain: Persistent aching or discomfort that may accompany abdominal cramps.
• Passing tissue or clots: Pink, grey or whitish tissue may pass through the vagina along with bleeding.
• Fluid leakage: A sudden release of fluid from the vagina, particularly during later pregnancy.
• Changes in pregnancy symptoms: Nausea or breast tenderness may decrease, although these symptoms can also fluctuate during a healthy pregnancy.

The signs of early miscarriage are not always specific. Mild spotting, abdominal discomfort and changes in pregnancy symptoms can occur for other reasons.

For example, bleeding during pregnancy may be associated with cervical irritation or other conditions that do not necessarily result in pregnancy loss.

If you experience bleeding or pain during pregnancy, contact your obstetrician or gynaecologist for assessment rather than assuming the cause.

What are the Main Causes of Miscarriage?

The causes of miscarriage vary, and in some cases, doctors cannot identify a specific reason.

Most early miscarriages occur because of problems affecting the embryo's development. However, certain medical conditions and pregnancy-related factors may also increase the risk.

1. Chromosomal Abnormalities

Chromosomal abnormalities are among the most common causes of early pregnancy loss.

Chromosomes carry genetic information required for the embryo's growth and development. Sometimes, an embryo develops with an extra or missing chromosome, preventing the pregnancy from progressing normally.

These abnormalities often occur by chance during fertilisation or early cell division and usually cannot be prevented.

2. Hormonal and Endocrine Disorders

Certain conditions affecting hormone production may contribute to pregnancy complications.

For example, poorly controlled thyroid disorders or some conditions involving hormonal imbalance can affect reproductive health and pregnancy development.

However, normal hormonal fluctuations alone should not be assumed to cause miscarriage. A doctor may recommend further testing when a specific endocrine disorder is suspected.

3. Uncontrolled Diabetes

Women with poorly controlleddiabetes may face an increased risk of pregnancy complications, including miscarriage.

Maintaining blood glucose levels within the range recommended by the treating doctor before conception and during pregnancy can help reduce certain risks.

4. Uterine or Cervical Problems

Certain structural abnormalities of the uterus may interfere with the development of a pregnancy.

Examples include some congenital uterine abnormalities and fibroids that significantly affect the uterine cavity.

Cervical insufficiency, a condition in which the cervix opens prematurely, may contribute to pregnancy loss during the second trimester.

5. Infections

Some infections can affect the developing pregnancy or the tissues supporting it.

Infections such as listeriosis, rubella and certain other maternal infections may be associated with pregnancy complications.

However, common minor illnesses do not automatically increase miscarriage risk. The effect depends on the infection, its severity and the stage of pregnancy.

6. Autoimmune and Blood Clotting Disorders

Antiphospholipid syndrome (APS), an autoimmune condition associated with abnormal blood clotting, can contribute to recurrent pregnancy loss.

Women with confirmed APS may require specialist monitoring and prescribed treatment during pregnancy.

7. Maternal Age and Lifestyle Factors

The likelihood of miscarriage generally increases with maternal age, particularly after 35, partly because chromosomal abnormalities become more common.

Other associated factors include smoking, alcohol consumption, significant obesity or being underweight, and exposure to certain harmful substances.

Note: Routine activities such as walking, appropriate exercise, working and sexual intercourse do not generally cause miscarriage in an otherwise uncomplicated pregnancy. Everyday emotional stress is also not an established direct cause of miscarriage.

What are the Different Types of Miscarriage?

Doctors use different terms to describe pregnancy loss depending on the symptoms, cervical findings and whether pregnancy tissue remains inside the uterus.

Threatened Miscarriage

A threatened miscarriage occurs when vaginal bleeding develops during early pregnancy, but the cervix remains closed and the pregnancy may still be viable.

It does not necessarily mean that miscarriage will occur. Many pregnancies continue following an episode of early bleeding.

The doctor may recommend ultrasound assessment and follow-up. Progesterone treatment may be considered for selected women with early pregnancy bleeding and a history of previous miscarriage.

Inevitable Miscarriage

An inevitable miscarriage refers to a situation in which the cervix has opened and clinical findings indicate that pregnancy loss is occurring or cannot be prevented.

Symptoms may include vaginal bleeding, abdominal cramps and sometimes fluid leakage.

Incomplete Miscarriage

An incomplete miscarriage occurs when some pregnancy tissue has passed from the uterus, but some remains inside.

This may cause continued bleeding or cramping. Depending on the findings, the doctor may recommend monitoring, medication or a procedure to remove the remaining tissue.

Complete Miscarriage

A complete miscarriage occurs when all pregnancy tissue has passed from the uterus.

If the woman is clinically stable and examination confirms that the miscarriage is complete, further treatment may not be necessary.

Missed Miscarriage

A missed miscarriage occurs when a pregnancy has stopped developing, but the body has not yet expelled the pregnancy tissue.

There may be no bleeding, cramping or other noticeable symptoms. The condition is often identified during an ultrasound examination.

Recurrent Miscarriage

Recurrent miscarriage refers to repeated pregnancy losses. Definitions vary between medical organisations, with some considering two or more losses and others using three or more.

Women who have experienced repeated miscarriages may be advised to undergo investigations for possible genetic, uterine, hormonal or autoimmune causes.

Septic Miscarriage

A septic miscarriage occurs when pregnancy loss is complicated by infection in the uterus.

Symptoms may include fever, severe abdominal pain, foul-smelling vaginal discharge and feeling significantly unwell.

This is a medical emergency requiring urgent hospital assessment and treatment.

Miscarriage at Different Stages of Pregnancy: What to Expect

The symptoms, investigations and treatment of pregnancy loss can differ considerably depending on how far the pregnancy has progressed.

Pregnancy is medically dated from the first day of the last menstrual period, rather than the day of conception.

A loss at four or five months may require a different clinical approach from an early miscarriage, including hospital-based management of labour and additional investigations.

How is a Miscarriage Diagnosed?

Miscarriage diagnosis involves evaluating the symptoms, examining the pregnancy and determining whether it is developing as expected.

The doctor may recommend one or more of the following investigations.

Ultrasound Examination

An ultrasound is one of the primary methods used to assess a suspected miscarriage.

It helps determine:

• Whether the pregnancy is located inside the uterus
• Whether an embryo or foetus is visible
• Whether cardiac activity is present when it should be detectable
• Whether pregnancy tissue remains in the uterus

A transvaginal ultrasound may be recommended in early pregnancy because it can provide clearer images.

An important point: In very early pregnancy, the absence of a visible embryo or heartbeat on a single scan does not always confirm miscarriage. A repeat ultrasound may be necessary before making a definitive diagnosis.

Blood Tests

Blood tests may measure human chorionic gonadotrophin (hCG), the hormone produced during pregnancy.

When the pregnancy's status is uncertain, the doctor may recommend repeating the test to assess how hormone levels are changing.

However, hCG results alone cannot always confirm a miscarriage or establish the pregnancy's location.

Pelvic Examination

A pelvic examination may be performed to assess bleeding, cervical changes or signs of infection.

Additional Tests for Repeated Pregnancy Loss

Women with recurrent miscarriage may be advised to undergo further investigations, including:

• Thyroid function testing
• Tests for antiphospholipid syndrome
• Assessment of blood glucose control
• Ultrasound or other investigations for uterine abnormalities
• Genetic testing in selected cases

Not every woman requires all these tests. The investigations depend on her medical history, pregnancy stage and clinical findings.

What are the Treatment Options for Miscarriage?

Miscarriage treatment depends on the stage of pregnancy, bleeding, risk of infection, ultrasound findings and the woman's medical condition and preferences.

When an early miscarriage is confirmed, the main approaches include expectant management, medication and surgical treatment.

1. Expectant Management

Expectant management involves allowing the pregnancy tissue to pass naturally without immediate medication or surgery.

This may be suitable for certain women who are clinically stable and have no signs of infection or significant bleeding.

Bleeding and cramping may begin within days, although the process sometimes takes longer.

Follow-up is important to confirm that the miscarriage has completed and no further intervention is needed.

2. Medical Management

Doctors may recommend medical management to help the uterus expel pregnancy tissue without surgery.

This approach involves prescribed treatment that stimulates uterine contractions, leading to cramping, bleeding and the passage of pregnancy tissue. Temporary side effects such as nausea or diarrhoea may also occur.

Medical management should be carried out under a doctor's guidance, with appropriate follow-up to confirm that the miscarriage is complete and identify any complications.

3. Surgical Management

Surgical treatment may be recommended when:

• Bleeding is excessive
• There are signs of infection
• Pregnancy tissue remains in the uterus
• Medical or expectant management is unsuccessful
• A procedure is the preferred suitable option

Procedures may include vacuum aspiration or surgical evacuation of the uterus, depending on gestational age and clinical circumstances.

The treating doctor will explain the procedure, anaesthesia requirements, possible risks and recovery.

4. Management of Later Pregnancy Loss

Pregnancy loss during the second trimester usually requires specialist hospital care.

Depending on the gestational age and clinical findings, labour may begin naturally or medication may be used to initiate it. Additional procedures may sometimes be required.

The healthcare team may also recommend investigations to help identify a possible cause.

5. Additional Medical Care

Women with RhD-negative blood may require an anti-D immunoglobulin injection following pregnancy loss, depending on the gestational age, treatment and applicable clinical guidance.

If infection develops, treatment may include antibiotics and, when necessary, removal of retained pregnancy tissue.

The appropriate treatment is determined after medical assessment rather than through symptoms alone.

What to Expect After a Miscarriage

Recovery after a miscarriage involves both physical and emotional changes. The experience varies depending on the pregnancy stage, treatment received and individual circumstances.

Physical Recovery

After an early miscarriage, women may experience:

• Vaginal bleeding or spotting for around one to two weeks
• Mild abdominal cramps for several days
• Temporary tiredness or physical discomfort
• Gradual reduction in pregnancy-related symptoms

Menstrual periods may return within approximately four to eight weeks, although the timing varies.

Follow the doctor's instructions regarding medications, follow-up testing and when to resume sexual activity.

Emotional Recovery

Pregnancy loss can bring feelings of sadness, disappointment, confusion, anger or anxiety. Some women experience these emotions immediately, while others process the experience gradually.

There is no fixed timeline for emotional recovery.

Talking with a partner, trusted family member, counsellor or mental health professional may help when emotional distress becomes difficult to manage.

When Can You Try to Conceive Again?

Ovulation can return before the first menstrual period following a miscarriage, so pregnancy may be possible relatively soon.

After an uncomplicated early miscarriage, many women can consider trying again when their symptoms have resolved and they feel physically and emotionally ready.

However, women who have experienced later pregnancy loss, complications or repeated miscarriages may need additional investigations and individualised advice before conceiving again.

Can Miscarriage Be Prevented?

Not every miscarriage can be prevented. Many early pregnancy losses result from random chromosomal abnormalities that cannot be controlled through diet, exercise or lifestyle changes.

However, certain steps can help support reproductive health and reduce some modifiable pregnancy risks.

• Attend regular antenatal appointments: Routine pregnancy monitoring helps identify concerns that may require medical attention.
• Manage existing health conditions: Work with your doctor to control conditions such as diabetes and thyroid disease.
• Avoid smoking and alcohol: These exposures are associated with pregnancy complications and should be avoided.
• Maintain a healthy weight: A balanced diet and appropriate physical activity support general health before and during pregnancy.
• Review medications: Discuss prescription medicines, supplements and existing treatments with your doctor before conception or during pregnancy.
• Take recommended prenatal supplements: Folic acid is important for reducing the risk of neural tube defects, although it is not a treatment for preventing miscarriage.
• Seek advice after repeated losses: Investigations may identify conditions for which targeted treatment is available.

Women planning a pregnancy can also benefit frompre-pregnancy counselling, particularly when they have existing medical conditions or a history of pregnancy complications.

When Should You Seek Medical Attention?

Any bleeding during pregnancy should be discussed with a healthcare professional, even when it is light.

Contact your obstetrician or gynaecologist if you experience vaginal spotting, persistent cramps, unusual discharge or a sudden leakage of fluid.

Seek emergency medical care immediately if you experience:

• Heavy vaginal bleeding, particularly when soaking pads rapidly
• Severe or worsening abdominal pain
• One-sided abdominal pain, shoulder-tip pain, dizziness or fainting
• Fever, chills or foul-smelling vaginal discharge
• Severe weakness, confusion or loss of consciousness

Some of these symptoms may indicate significant blood loss, infection or an ectopic pregnancy, in which the pregnancy develops outside the uterus.

An ectopic pregnancy is a separate condition from miscarriage and can become life-threatening without prompt treatment.

Seeking the Right Care and Support After Pregnancy Loss

Miscarriage can occur for several reasons, many of which are outside a woman's control. While early pregnancy loss is relatively common, recognising possible symptoms and obtaining an accurate diagnosis are important for identifying the appropriate next steps.

Treatment and recovery vary according to the stage of pregnancy and individual medical circumstances. Following a miscarriage, medical follow-up can also help address physical concerns, emotional well-being and questions about future pregnancies.

At Apollo Spectra Hospitals, our gynaecology services support women experiencing reproductive health concerns, including assessment of abnormal bleeding and other pregnancy-related symptoms. The appropriate care pathway depends on the clinical findings and services available at the hospital.

To discuss concerns about pregnancy bleeding, reproductive health or previous pregnancy loss, explore ourgynaecology services and check consultation availability at your preferred location.

If you are experiencing heavy bleeding, severe pain or fainting during pregnancy, seek emergency hospital care immediately rather than waiting for a routine appointment.