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What Is a Threatened Miscarriage?
It is abnormal vaginal bleeding during pregnancy, usually within the first 20 weeks, that may signal a need for caution. The cervix remains closed, and the bleeding may be fresh blood or blood-stained mucus. Seeking prompt medical attention is important for appropriate care.
If symptoms occur, rest and avoid activities that may increase risk. Careful medical care can help reduce miscarriage risk. However, if symptoms are severe or bleeding increases, seek immediate medical attention.
When to Be Particularly Alert
Particular attention is important in the first 1–3 months because most miscarriages occur during this period. The most common cause is an embryonic chromosomal abnormality, which is not caused by anything the mother did. Stop risky behaviors such as smoking or drinking alcohol as soon as you know you are pregnant or begin planning a pregnancy.
Vaginal bleeding can also occur in the second and third trimesters. It may relate to cervical weakness, uterine or placental abnormalities, infection or poorly controlled maternal medical conditions. Bleeding at these stages always needs medical assessment (source: ACOG). Housework, normal exercise and sex in an otherwise healthy pregnancy do not cause miscarriage. Attend scheduled appointments, regularly watch for unusual symptoms and consult your doctor promptly if something seems wrong or you are unsure.
Causes
Understanding possible causes and risk factors can help pregnant women prepare and reduce risks. Several factors may be involved:
Maternal age: Mothers older than 35 have a higher risk, which increases with age.
Previous miscarriage: Women with a history of miscarriage have a higher risk.
Chronic conditions: Diabetes, obesity and high blood pressure.
Fetal abnormalities: Abnormalities involving chromosomes or the baby's structure.
Infection: Certain infections during pregnancy, such as vaginal or uterine infections and some infectious diseases affecting the baby.
Environmental factors:
Risky behaviors: Smoking, drinking alcohol and exposure to stress.
Stress-related feelings: Pressure and stress from work or social circumstances.
Medical assessment and care are important during pregnancy to reduce the risk of threatened miscarriage. Consult your doctor promptly if unusual symptoms occur.
How to Recognize Symptoms
Vaginal bleeding: If bleeding does not stop, see a doctor immediately.
Blood color: Bright red blood may indicate a problem, while dark blood may represent blood retained in the uterus.
Abdominal pain: Cramping that progressively increases may indicate uterine contractions.
Important: Go to hospital immediately for heavy bleeding, passing clots or tissue, increasing abdominal pain, fever or feeling faint. In an emergency, call 1669, Thailand's emergency medical number, available 24 hours. Prompt treatment and care are important for the safety of mother and baby.
Treatment
There is no specific treatment, so care generally focuses on relieving symptoms and supporting physical recovery. Self-care also plays an important role in reducing risk and supporting physical and mental health during pregnancy. Consider these steps:
Rest and reduce activity: Rest when your body needs it. Reducing strenuous activities gives your body a better opportunity to recover.
Eat appropriately: Choose health-supporting foods containing protein and important vitamins and minerals.
Manage stress: Care for your mental well-being. Meditation, deep breathing or talking to someone close can help reduce stress.
Avoid certain activities: Avoid risky or potentially harmful activities, such as sex.
Monitor symptoms: Watch for changes and tell your doctor whenever symptoms change.
Review your risks: Consult your doctor to understand risks and plan appropriate care.
Care for your emotional health: A threatened miscarriage does not always mean a pregnancy will end. Many women with early-pregnancy bleeding continue to have a normal pregnancy (source: NHS). If you feel very worried, talk to your doctor or prenatal nurse.
Self-care during a threatened miscarriage is important for reducing stress and supporting physical recovery.
Prevention
Protecting maternal health is the most important way to reduce pregnancy risks. These measures can help:
Avoid harmful substances: Smoking, drinking alcohol and using recreational drugs affect the baby's health and increase risk.
Take essential vitamins and nutrients: Take necessary supplements, especially folic acid, a B vitamin, as advised by your doctor. Read more about when to take prenatal supplements.
Treat and manage existing medical conditions: Controlling chronic conditions such as diabetes, high blood pressure and other illnesses is important for reducing risk.
Rest: Support your mental health, get enough rest and avoid stress to help reduce risk.
Avoid chemicals: Reduce contact with chemicals that may affect the baby, such as those in the workplace or home.
Avoid heavy lifting: Heavy lifting in the first trimester can increase risk.
Have health checks: Attend a pre-pregnancy health check and monitor yourself as soon as you know you are pregnant to maintain health and reduce risk.
However, miscarriages caused by chromosomal abnormalities cannot all be prevented. What mothers can do is care for their health and watch for unusual symptoms, including other pregnancy complications and abnormal vaginal discharge during pregnancy.
Prevention matters for both maternal and baby health. Good self-care and following medical advice help create a suitable environment for pregnancy and the baby's development.