Nausea During Pregnancy – Causes and Remedies

What Is Nausea During Pregnancy?

Nausea during pregnancy – commonly referred to as morning sickness – affects an estimated 70–80% of all pregnant women. It most frequently occurs between weeks 6 and 12 of pregnancy. Despite the name, morning sickness can strike at any time of day or night.

In most cases, pregnancy-related nausea is harmless and resolves after the first trimester. However, in some women it can be severe enough to require medical attention.

Causes

The exact causes of pregnancy nausea are not yet fully understood, but several contributing factors have been identified:

• Hormonal changes: The rapid rise in hCG (human chorionic gonadotropin), along with increased levels of estrogen and progesterone, are considered the primary triggers.
• Slowed gastric emptying: Progesterone relaxes smooth muscle, including that of the stomach, slowing digestion and contributing to nausea.
• Heightened sense of smell: Many pregnant women become especially sensitive to certain odors, which can trigger or worsen nausea.
• Blood sugar fluctuations: Low blood glucose levels – especially in the morning after fasting overnight – can intensify feelings of nausea.
• Genetic predisposition: Women with a family history of pregnancy nausea (e.g., in their mother or sisters) have a higher risk of experiencing it themselves.

Symptoms

Symptoms can range from mild to severe and may include:

• Persistent or recurrent nausea, especially in the morning
• Vomiting (in some women)
• Aversion to certain smells or foods
• Excessive saliva production (ptyalism gravidarum)
• General fatigue and weakness

Hyperemesis Gravidarum

A severe form of pregnancy nausea is known as hyperemesis gravidarum. It is characterized by uncontrollable vomiting, significant weight loss (more than 5% of body weight), dehydration, and electrolyte imbalances. It affects approximately 0.5–2% of all pregnancies and always requires prompt medical treatment.

Diagnosis

Diagnosis is typically based on the patient's medical history and a physical examination. To rule out hyperemesis gravidarum or other underlying conditions, the following tests may be performed:

• Urine test (for ketones, which indicate dehydration)
• Blood count and electrolyte levels
• Ultrasound (to rule out multiple pregnancies or molar pregnancy)

Treatment and Remedies

General Measures

Many cases of pregnancy nausea can be managed with simple lifestyle adjustments:

• Eat small, frequent meals to avoid an empty stomach
• Keep plain crackers or dry toast by the bedside to eat before getting up in the morning
• Stay well-hydrated by sipping fluids frequently throughout the day
• Avoid known smell triggers
• Limit fatty, spicy, or hard-to-digest foods
• Get plenty of rest and fresh air

Ginger

Ginger is one of the best-supported natural remedies for pregnancy nausea. Ginger tea, ginger biscuits, or ginger capsules have been shown to reduce nausea effectively. Studies suggest that ginger promotes gastric motility and has antiemetic properties. Women should consult their healthcare provider before taking ginger supplements during pregnancy.

Vitamin B6

Vitamin B6 (pyridoxine), when recommended by a doctor, has demonstrated effectiveness in several clinical studies for mild to moderate pregnancy nausea. It is important not to exceed the recommended dosage.

Acupressure

Wearing acupressure wristbands (targeting the P6 or Nei-Kuan point) may help reduce nausea in some women. This method is considered safe and generally free of side effects.

Medication

When non-pharmacological approaches are insufficient, a healthcare provider may consider the following medications:

• Antiemetics such as doxylamine/pyridoxine combinations
• Metoclopramide (in more severe cases)
• Ondansetron (for hyperemesis gravidarum, after careful risk-benefit assessment)
• Intravenous fluids and electrolyte replacement for hospitalized patients

All medications should only be taken under medical supervision following a careful assessment of risks to both mother and baby.

When to See a Doctor

The following warning signs require prompt medical attention:

• Frequent, uncontrollable vomiting
• Signs of dehydration: dry mouth, dark urine, dizziness
• Significant weight loss
• Blood in vomit
• Severe abdominal pain or fever

References

1. World Health Organization (WHO): Maternal nutrition and pregnancy. WHO Publications, Geneva.
2. American College of Obstetricians and Gynecologists (ACOG): Practice Bulletin No. 189 – Nausea and Vomiting of Pregnancy. Obstetrics and Gynecology, 2018.
3. Festin M: Nausea and vomiting in early pregnancy. BMJ Clinical Evidence, 2014. Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4003467/