🤢 Nausea & Vomiting
Understanding, managing, and relieving nausea and vomiting
Last reviewed: February 2026
📖 Understanding Nausea & Vomiting
Nausea is an unpleasant sensation of unease in the stomach with an urge to vomit. Vomiting (emesis) is the forceful expulsion of stomach contents through the mouth. While unpleasant, these are protective reflexes designed to expel harmful substances from the body.
The Vomiting Reflex
Vomiting is coordinated by the "vomiting center" in the brainstem, which receives signals from:
- Chemoreceptor trigger zone (CTZ): Detects toxins in blood
- Vestibular system: Inner ear (motion sickness)
- GI tract: Stretch receptors, irritation
- Higher brain centers: Anxiety, smells, sights
Related Terms
- Retching: Spasmodic respiratory movements against a closed glottis (dry heaving)
- Regurgitation: Passive backflow of food without nausea or effort
- Rumination: Repeated regurgitation and rechewing of food
🔬 Common Causes
Gastrointestinal Causes
- Gastroenteritis: Viral or bacterial stomach flu
- Food poisoning: Toxin-induced, rapid onset
- Gastroparesis: Delayed stomach emptying
- GERD/acid reflux: Especially in morning
- Peptic ulcer disease
- Gallbladder disease: Especially after fatty meals
- Pancreatitis: Severe, with pain
- Bowel obstruction: Medical emergency
- Appendicitis: With abdominal pain
Medications & Treatments
- Chemotherapy: Very common side effect
- Antibiotics: Especially erythromycin, metronidazole
- NSAIDs: Stomach irritation
- Opioid pain medications
- Anesthesia: Post-operative nausea
- Iron supplements
- Oral contraceptives
Central Nervous System
- Motion sickness: Cars, boats, planes
- Migraine: Often with nausea
- Vertigo: Inner ear disorders
- Concussion: Head injury
- Increased intracranial pressure: Often morning vomiting
- Meningitis: With fever and stiff neck
Other Causes
- Pregnancy: Morning sickness (first trimester)
- Hyperemesis gravidarum: Severe pregnancy vomiting
- Anxiety and stress
- Diabetic ketoacidosis
- Kidney failure (uremia)
- Alcohol hangover
- Eating disorders: Bulimia
- Heart attack: Especially in women
🚨 When to Seek Medical Care
- Vomiting blood (red or coffee-ground appearance)
- Severe abdominal pain
- Signs of dehydration (dizziness, decreased urination, dry mouth)
- High fever (over 101°F/38.5°C)
- Stiff neck with vomiting
- Confusion or altered consciousness
- Chest pain with vomiting
- Vomiting after head injury
- Inability to keep any fluids down for 24 hours
- Green or fecal-smelling vomit (possible obstruction)
- Vomiting with severe headache ("worst headache of life")
- Vomiting lasts more than 2 days (adults) or 24 hours (children)
- Unable to keep down medications you need
- Unintentional weight loss with chronic nausea
- Vomiting after every meal
- Projectile vomiting
- Nausea lasting more than 1 week
💊 Treatment Options
Anti-Nausea Medications (Antiemetics)
| Medication | Type | Best For |
|---|---|---|
| Ondansetron (Zofran) | 5-HT3 antagonist | Chemotherapy, post-operative, gastroenteritis |
| Metoclopramide (Reglan) | Dopamine antagonist, prokinetic | Gastroparesis, post-operative |
| Promethazine (Phenergan) | Antihistamine | Motion sickness, general nausea |
| Dimenhydrinate (Dramamine) | Antihistamine | Motion sickness |
| Meclizine (Antivert) | Antihistamine | Vertigo, motion sickness |
| Scopolamine patch | Anticholinergic | Motion sickness prevention |
| Prochlorperazine (Compazine) | Dopamine antagonist | General nausea, migraine |
For Pregnancy-Related Nausea
- Vitamin B6 (Pyridoxine): First-line, 25-50mg three times daily
- Doxylamine + B6 (Diclegis/Diclectin): FDA-approved for pregnancy
- Ginger: Safe and effective
- Ondansetron: If other options fail (discuss with doctor)
For Motion Sickness
- Scopolamine patch (apply 4 hours before travel)
- Dimenhydrinate or meclizine (take 30-60 minutes before travel)
- Sit in front of car, look at horizon
- Avoid reading while moving
🏠 Home Remedies & Self-Care
Immediate Relief
- Rest: Lie down in a dark, quiet room
- Fresh air: Open a window or sit outside
- Cool compress: On forehead or back of neck
- Avoid strong odors: Cooking smells, perfumes
- Loose clothing: Avoid tight waistbands
- Acupressure: Press P6 point (inside wrist, 3 finger-widths from crease)
Natural Remedies
One of the most effective natural remedies for nausea. Options include: fresh ginger tea (steep sliced ginger in hot water), ginger ale (real ginger, not flavored), ginger chews or candies, ginger capsules. Effective for motion sickness, pregnancy nausea, and chemotherapy-induced nausea.
Peppermint tea or sniffing peppermint essential oil can help relieve nausea. May relax the stomach muscles. Avoid if you have GERD, as peppermint can worsen reflux.
The scent of lemon can help reduce nausea. Sniff a cut lemon, add lemon to water, or suck on a lemon wedge. Often helpful in pregnancy-related nausea.
Chewing fennel seeds or drinking fennel tea can help settle the stomach. Traditional remedy used across cultures. Has mild antispasmodic properties.
Hydration
- Sip small amounts of clear fluids frequently
- Ice chips if swallowing liquids is difficult
- Wait 30-60 minutes after vomiting before drinking
- Start with 1-2 tablespoons every 10-15 minutes
- Oral rehydration solution if significant fluid loss
🍽️ Diet During Nausea
When Nauseous
- Avoid eating until the worst passes
- Sip clear liquids: Water, clear broth, diluted apple juice
- Avoid: Strong smells, sight of food if it worsens nausea
When Ready to Eat
- Start bland: Crackers, toast, plain rice
- Eat small amounts: Little and often
- Room temperature foods: Less odor than hot foods
- Avoid: Fatty, greasy, spicy, or very sweet foods
- Dry foods first: Crackers, dry toast before liquids
Foods to Gradually Add
- Plain khichdi
- Boiled potatoes
- Plain idli
- Bananas
- Applesauce
- Thin dal
- Curd rice
🤰 Nausea in Pregnancy
Morning sickness affects 70-80% of pregnant women, typically starting around week 6 and improving by week 12-14.
Management Tips
- Eat before getting out of bed
- Small, frequent meals (every 2-3 hours)
- Protein-rich snacks before bed
- Avoid triggers (smells, foods, heat)
- Ginger in various forms
- Vitamin B6 supplements
- Acupressure wristbands
- Stay hydrated
When to Worry
Contact your doctor if you have:
- Severe, persistent vomiting (cannot keep anything down)
- Dark urine or no urination for 8+ hours
- Weight loss of more than 5%
- Blood in vomit
- Fever
- Abdominal pain
These may indicate hyperemesis gravidarum, which requires medical treatment.
❓ Frequently Asked Questions
No, do not induce vomiting unless specifically instructed by poison control (for certain ingestions). Let your body decide. Forced vomiting can damage the esophagus, cause aspiration, and create electrolyte imbalances. Focus on rest and small sips of fluid.
Morning nausea can be caused by: low blood sugar (eating before bed can help), pregnancy, GERD (acid builds up overnight), anxiety, gastroparesis, or medication side effects (if you take meds at night). If persistent, see a doctor.
Generally, if your body needs to vomit, let it happen rather than fighting it hard - vomiting is a protective reflex. However, chronic vomiting or self-induced vomiting should be evaluated by a doctor due to complications like dehydration, electrolyte imbalances, and esophageal damage.
Motion sickness occurs when there is a mismatch between what your eyes see and what your inner ear senses. Looking at a stable point (like the horizon) helps your brain reconcile these signals. Looking at something moving (like a book) worsens the mismatch.