Morning sickness is a common symptom experienced by many pregnant women, but few people have accurate knowledge about its causes and solutions. Various physiological factors such as hormonal changes, thyroid function changes, and iron deficiency trigger morning sickness, and the severity of symptoms varies depending on an individual's health status, nutritional status, and sleep patterns. This article identifies the precise causes of morning sickness and introduces 28 natural remedies based on scientific evidence to help alleviate symptoms.
What is Morning Sickness?
Morning sickness is the nausea and vomiting experienced during early pregnancy. In medical terminology, it's called "pregnancy nausea," and it doesn't occur only in the morning but can appear at any time during the day. The intensity of morning sickness varies from mild nausea to severe vomiting, and some pregnant women experience taste changes, becoming sensitive to food odors or specific flavors.
Morning sickness is not simply a gastrointestinal disorder but a physiological phenomenon that occurs as the body adapts to pregnancy. The main cause is that hormone levels rise dramatically during the first three months of pregnancy, affecting the vomiting center in the brain. At this time, the rapid increase in human chorionic gonadotropin (hCG) and estrogen disrupts the body's chemical balance.
Is Morning Sickness a Common Symptom?
Morning sickness is a very common symptom, with 50–90% of pregnant women experiencing it in early pregnancy. According to research from the American College of Obstetricians and Gynecologists (ACOG), approximately 70% of pregnant women experience some degree of nausea, and 30–50% experience actual vomiting. Interestingly, approximately 10–25% of pregnant women don't experience morning sickness at all, which varies depending on an individual's physiological sensitivity, nutritional status, and hormone levels.
The fact that morning sickness is common means it's a normal part of pregnancy, but it also means that many pregnant women experience difficulties in daily life due to this symptom. When the severity of morning sickness is severe, specifically when hyperemesis gravidarum occurs, complications such as inadequate nutrient intake, dehydration, and weight loss can develop, making consultation with a healthcare professional essential.
When Does Morning Sickness Occur?
Morning sickness typically begins around 4–6 weeks of pregnancy and gradually subsides around 12–14 weeks. In some pregnant women, morning sickness can start before they even realize they're pregnant, as hormonal changes occur very rapidly. The period when morning sickness is most severe is weeks 8–12 of pregnancy, during which time hCG levels reach their peak.
There's good news for most pregnant women. As pregnancy enters the second trimester (after week 13), morning sickness symptoms naturally disappear. About 80% of pregnant women find their symptoms completely resolve by week 16 of pregnancy, and the remaining 20% improve within 20 weeks. However, in rare cases, morning sickness may persist throughout the entire pregnancy, so if severe symptoms continue for more than three months, you should consult with a healthcare professional.
Does the Baby's Sex Affect Morning Sickness?
Many pregnant women believe that the degree of morning sickness is related to the baby's sex. Some research has actually reported interesting results: morning sickness tends to be more severe when pregnant with a girl than when pregnant with a boy. This is thought to be because hormone levels, particularly estrogen levels, are higher during pregnancy with a female baby.
However, this relationship is not absolute, and individual variations are significant. Even when pregnant with babies of the same sex, the intensity of morning sickness can vary greatly from person to person. Therefore, predicting a baby's sex based solely on the severity of morning sickness has low reliability. A baby's sex can be confirmed accurately only through medical methods such as ultrasound or amniocentesis.
Is There a Relationship to the Number of Pregnancies?
Interestingly, the severity of morning sickness shows differences between first pregnancies and subsequent pregnancies. Of pregnant women who experienced morning sickness during their first pregnancy (primigravida), 70–80% tend to experience morning sickness again during their second pregnancy (multigravida). However, the intensity of morning sickness tends to be lighter or similar in multigravida pregnancies.
There are cases where pregnant women who have never experienced morning sickness suddenly experience severe morning sickness during their second pregnancy, and conversely, there are cases where severe morning sickness during the first pregnancy nearly disappears in the second pregnancy. This is because the hormonal environment, body's health status, stress levels, and nutritional status differ with each pregnancy. Additionally, stress from childcare, sleep deprivation, and irregular eating habits in multigravida pregnancies can further worsen morning sickness.
What Causes Morning Sickness?
Hormonal changes are the primary cause of morning sickness. Rapidly increasing hCG hormone in early pregnancy stimulates the vomiting center in the brain. Simultaneously, estrogen and progesterone levels also rise, which slows gastric motility and relaxes the esophageal sphincter, triggering nausea. These hormones also make the sense of smell and taste more sensitive, causing pregnant women to reject foods they previously enjoyed.
Changes in thyroid function are also closely related to morning sickness. As thyroid hormones (TSH, T3, T4) change in early pregnancy, metabolism is affected. A temporary state of overactive thyroid function (hyperthyroidism) may occur, which causes nausea, fatigue, and anxiety. According to research, the higher the thyroid hormone levels, the more severe the morning sickness tends to be.
Iron deficiency is an important factor that worsens morning sickness. As blood volume increases during pregnancy, iron demand increases by more than 50%, yet many pregnant women fail to adequately replenish it. Iron deficiency causes nausea, fatigue, and dizziness, and if nutritional intake due to morning sickness becomes severe, this problem creates a vicious cycle. Pregnant women with iron levels below the normal range report morning sickness symptoms that are 30–40% more severe.
Vitamin B6 deficiency is also an important cause. Vitamin B6 is essential for neurotransmitter production and hormone metabolism, and its requirement increases during pregnancy. Low B6 levels tend to intensify nausea and vomiting. In fact, studies show that when vitamin B6 is supplemented to pregnant women, morning sickness symptoms improve by about 25–50%.
Protein deficiency is an easily overlooked cause. Protein serves as the raw material for hormones and neurotransmitters and plays an important role in stabilizing blood sugar. More than 50g of protein per day is needed in early pregnancy, but when adequate nutrient intake is difficult due to morning sickness, blood sugar becomes unstable and nausea intensifies. Pregnant women with sufficient protein intake tend to experience 20–30% lighter morning sickness symptoms compared to those without adequate intake.
Sleep deprivation and fatigue significantly worsen morning sickness. In early pregnancy, the body needs more sleep than usual due to increased progesterone, but it's difficult to get adequate sleep due to frequent urination, anxiety, and physical discomfort. When sleep is insufficient, the nervous system becomes hypersensitive, morning sickness symptoms worsen, the immune system weakens, and stress hormones (cortisol) increase. Pregnant women who get at least eight hours of sleep per day have noticeably less morning sickness than those who don't.
Psychological stress also plays an important role. Anxiety about pregnancy, worry about body changes, and stress from work and home stimulate the sympathetic nervous system, triggering nausea. Pregnant women who engage in activities that stimulate the parasympathetic nervous system, such as yoga, meditation, and deep breathing, report approximately 30% less morning sickness.
28 Natural Remedies
Nutrition-Related Remedies (1–10)
1. Eat Small Amounts Frequently: Avoiding an empty stomach is key to relieving morning sickness. Eating five to six smaller meals throughout the day rather than three large meals stabilizes blood sugar and reduces nausea.
2. Prioritize Protein Intake: Consuming protein such as eggs, yogurt, or cheese as the first food of the morning stabilizes blood sugar, reducing nausea by about 50%.
3. Ginger Tea: Ginger has been used as a remedy for morning sickness for thousands of years in traditional medicine. Drinking one to two grams of ginger as tea daily reduces morning sickness symptoms by 25–40% according to research.
4. Lemon Consumption: The sour taste provides opposite stimulation to the nausea center, alleviating queasiness. Drinking lemon water or inhaling lemon scent is also effective.
5. Vitamin B6 Supplementation: Supplementing 25–50mg of vitamin B6 daily reduces morning sickness by 25–50%. It's abundant in eggs, chicken, fish, and nuts, and supplement supplements are also effective.
6. Iron Supplementation: The recommended daily iron intake for pregnant women is 27mg. If iron deficiency is confirmed, take supplements, but taking them in the evening causes less nausea.
7. Enhance Vitamin C: Vitamin C-rich foods such as oranges, kiwis, and bell peppers enhance iron absorption and strengthen immunity.
8. High-Protein Snacks: Consuming cheese, nuts, and yogurt before bedtime and 30 minutes before waking in the morning prevents blood sugar fluctuations and reduces morning nausea.
9. Avoid Spicy Foods: During morning sickness, the stomach becomes sensitive and spicy foods, fatty foods, and caffeine worsen symptoms.
10. Fluid Intake: Dehydration worsens nausea. Consume 2–3 liters of water daily, but drink it frequently in small amounts rather than all at once.
Sleep and Fatigue Recovery Remedies (11–15)
11. Adequate Sleep: A minimum of 8–9 hours of sleep daily is essential. Sleep deprivation worsens morning sickness by 40–50%.
12. Regular Sleep Schedule: Going to bed and waking up at the same time every day stabilizes the body's circadian rhythm and alleviates hormone imbalance.
13. Napping: A 20–30 minute nap daily is effective for fatigue recovery in early pregnancy. Taking a short nap around 2–3 p.m. reduces evening morning sickness symptoms.
14. Comfortable Sleep Environment: A dark environment, appropriate temperature (16–19°C), and a quiet space promote deep sleep and lower cortisol levels.
15. Pre-Sleep Relaxation: Avoiding electronic devices one hour before bed and drinking warm milk or chamomile tea helps with better sleep.
Exercise and Yoga Remedies (16–20)
16. Prenatal Yoga: Fifteen to twenty minutes of gentle yoga activates the parasympathetic nervous system, reducing nausea by 25–35%. The Mountain Pose and Butterfly Pose are particularly effective.
17. Walking: A gentle 20–30 minute daily walk promotes metabolism and relieves nausea through fresh air intake.
18. Deep Abdominal Breathing: Abdominal breathing activates the parasympathetic nervous system, reducing stress by 30% and alleviating morning sickness. Performing it three times daily for five minutes each is effective.
19. Stretching: Gentle stretching of the neck, shoulders, and back relieves muscle tension and improves blood circulation, alleviating nausea.
20. Water Exercise: Gentle water aerobics in warm water promotes metabolism without straining the joints.
Natural Treatments and Sensory Remedies (21–28)
21. Peppermint Scent: Inhaling peppermint oil immediately reduces nausea by 25–40%. You can drop oil on a tissue and bring it to your nose, or peppermint candy is also effective.
22. Ginger Supplements: Taking ginger supplements (1000–2000mg daily) instead of tea alleviates morning sickness by about 50%.
23. B-Complex Vitamins: Supplements containing vitamin B6, B12, and folic acid promote hormone metabolism and stabilize the nervous system.
24. Acupressure: Applying pressure to the inner wrist, approximately three fingers' width from the inner wrist crease toward the elbow (PC8 point), relieves nausea by 30–50%. Wearing acupressure bands is also an option.
25. Aromatherapy: Dispersing lavender, chamomile, and rose oils with a diffuser alleviates morning sickness through stress relief and improved sleep.
26. Warm Bath: Taking a 15–20 minute warm bath (38–40°C) once daily relieves muscle tension and decreases stress hormones.
27. Music Therapy: Listening to classical music or meditation music for 20–30 minutes daily activates the parasympathetic nervous system, alleviating nausea.
28. Vinegar Use: Drinking apple cider vinegar mixed with water or inhaling vinegar scent immediately alleviates nausea by suppressing the nausea center through sour taste stimulation.
When to Consult a Healthcare Professional
If morning sickness is accompanied by the following symptoms, you should definitely consult with an obstetrician:
- Severe vomiting four or more times daily, making food intake impossible
- Weight loss of 2kg or more in one month
- Dehydration symptoms such as frequent urination, dizziness, or dark-colored urine
- Symptoms continuing after 12 weeks
- Severe abdominal pain, fever, or other accompanying symptoms
In these cases, your doctor may consider prescribing anti-nausea medication, nutritional infusion therapy, or thyroid function testing.
Summary
Causes of Morning Sickness: Hormonal changes (hCG, estrogen, progesterone), thyroid function changes, iron deficiency, vitamin B6 deficiency, protein deficiency, sleep deprivation, and stress work in combination.
Onset: Morning sickness begins at 4–6 weeks of pregnancy, is most severe at 8–12 weeks, and subsides for most after week 16.
28 Natural Remedies: Combining nutritional management (ginger, lemon, vitamin B6, iron), sleep and fatigue recovery (adequate sleep, napping), exercise (yoga, walking, abdominal breathing), and natural treatments (peppermint, acupressure, aromatherapy) can alleviate morning sickness symptoms by over 50%.
Precautions: If hyperemesis gravidarum is suspected or symptoms are extreme, you must consult with a healthcare professional. All supplements and medications must be taken only after receiving approval from your healthcare provider.
