Nausea is a complaint that almost everyone experiences severely at least a few times in their lives and that seriously disrupts daily life. More than 60 thousand people search "what causes nausea" on Google every month, because this feeling is both very disturbing and often difficult to understand the underlying cause. Sometimes it can come suddenly when you wake up in the morning, sometimes during a car ride, and sometimes in the middle of the night. In this article, we will explain 25 different causes of nausea, one by one, in full detail, starting from the physiology of nausea, from the most innocent daily causes to the most serious diseases. We will also share 15 effective methods that you can apply on your own at home.
How Does the Physiology of Nausea Work? The Secret Connection Between the Brain and Stomach
Nausea is actually a very clever protection mechanism of the body. There is a small area at the base of our brain called "area postrema" and popularly known as the "vomiting center". This area instantly detects toxic substances in the bloodstream, hormone changes, imbalances in the inner ear and signals from the intestines. As soon as it detects it, it sends a "stop, empty" command to the stomach via the vagus nerve. That's when the unbearable feeling of nausea we feel begins.
The interesting thing is that during nausea, your stomach is not even full most of the time. Just because the brain says "there is danger", it activates the stomach muscles in the opposite direction and starts a pushing movement towards the esophagus. That's why sometimes you may feel nauseated for hours even if you haven't eaten anything.
The 10 Most Common Causes of Daily Life
Many people immediately attribute nausea to a serious illness, but in reality, 70-80% of cases are completely related to daily life:
- Overeating, especially after fatty, spicy and fried meals, delays gastric emptying and nausea becomes inevitable.
- Food poisoning (stale meat, spoiled dairy products, poorly cooked chicken) causes severe nausea and vomiting within 4-48 hours.
- Alcohol, especially when consumed excessively in one night, directly irritates the stomach mucosa and causes "hangover" nausea the next day.
- Excess or sudden cessation of caffeine (going from 5-6 cups of coffee a day to zero) can cause migraine-like nausea.
- Motion sickness (car, bus, plane, boat sickness) occurs when the balance organ in the inner ear sends the wrong signal to the brain.
- Stress and anxiety directly stimulate the vagus nerve; Even stress before an exam, a job interview or traffic can cause severe nausea.
- Insomnia and extreme fatigue lower blood sugar, increase adrenaline and trigger nausea.
- Closed, airless, smelly environments (crowded bus, perfume smell, paint smell) directly stimulate the vomiting center of the brain.
- Some medications (antibiotics, opioid painkillers, iron pills, chemotherapy drugs) irritate the gastric mucosa.
- Premenstrual syndrome and menstrual hormone fluctuations (especially the decrease in estrogen and progesterone) increase nausea.
What Causes Nausea During Pregnancy?
Nausea during pregnancy is so common that it has earned a special name as "morning sickness", but it can actually happen at any time of the day. The reason is very clear:
The rapidly rising beta-HCG hormone and estrogen during pregnancy make the vomiting center extremely sensitive. In addition, progesterone hormone slows gastric emptying and increases reflux. Nausea continues in 80% of women in the first 3 months, and in some women throughout the entire pregnancy.
In severe cases, hyperemesis gravidarum develops; Vomiting 10-15 times a day, dehydration, weight loss and serum treatment in the hospital may be required. It is a serious condition that can be seen even in celebrities, as British Princess Kate Middleton experienced in all three of her pregnancies.
Nausea in Digestive System Diseases
Nausea is most common in digestive system diseases:
- Gastritis and ulcer: Helicobacter pylori bacteria or long-term use of painkillers inflames the inner surface of the stomach, nausea begins 1-2 hours after eating.
- Reflux (GERD): When stomach acid enters the esophagus, nausea occurs with burning sensation, especially when lying down.
- Gallbladder stones and inflammation: Right upper quadrant pain and severe nausea are typical after a fatty meal.
- Irritable bowel syndrome (IBS): Intestinal spasms triggered by stress lead to nausea.
- Celiac disease and lactose intolerance: When gluten or milk sugar cannot be digested, gas, bloating and nausea occur in the intestine.
What Causes Nausea in Serious Diseases?
Unfortunately, sometimes nausea can be the first and only symptom of very serious diseases:
- In migraine attacks, nausea and vomiting are so severe that the person has to lie in a dark room for hours.
- Brain tumor or increased intracranial pressure (hydrocephalus, bleeding) may manifest itself with severe nausea and vomiting in the morning.
- In a heart attack, especially in women and the elderly, only nausea, sweating and weakness may occur instead of classic chest pain.
- In renal failure, accumulation of urea and creatinine causes nausea, which is more severe in the morning.
- Ammonia accumulation in liver failure and cirrhosis causes nausea and confusion.
- Anemia (iron, B12, folic acid deficiency) causes constant mild nausea because not enough oxygen reaches the tissues.
- Hyperthyroidism (overactive thyroid gland) accelerates the metabolism and causes nausea along with palpitations.
- Both the tumor itself and chemotherapy/radiotherapy are the most severe causes of nausea in cancer patients.
What Causes Nausea in Children?
Most common causes in children:
- Viral gastroenteritis (“stomach flu”): Viruses such as rotavirus and norovirus cause fever, vomiting and diarrhea within 24-48 hours.
- Food allergy/intolerance: Especially cow's milk protein allergy causes severe nausea and vomiting in babies.
- Acetonemia syndrome: When the child is hungry for a long time or has a fever, the body burns fat, ketone bodies increase and vomiting begins.
- Appendicitis: If there is nausea along with abdominal pain in children over the age of 5, urgent surgery is necessary.
What is Good for Nausea? 15 Natural and Quick Remedies at Home
- Fresh or powdered ginger (mix 1 teaspoon of powdered ginger with honey and eat or drink tea).
- Chew fresh mint leaves or boil mint-lemon and drink it.
- Chamomile tea soothes the stomach and reduces spasm.
- Eating 1-2 salted crackers or dry bread on an empty stomach stops nausea.
- Drink cold water slowly, in small sips.
- Apply pressure to the P6 (Nei-Kuan) point on the inside of the wrist, 3 fingers below between the two tendons, for 1-2 minutes. This is where seasickness patches work.
- Put a cold compress on your forehead or the back of your neck.
- Stay away from nausea-inducing odors (perfume, food, cigarettes).
- Ventilate the room thoroughly, get fresh air.
- Breathe deeply and slowly, it reduces anxiety.
- Squeeze 10 drops of lemon into a teaspoon of carbonated water and drink (neutralizes stomach acid).
- Chew a few cloves or drink clove tea.
- Fennel tea relieves gas and nausea at the same time.
- Probiotic yoghurt (sugar-free) regulates intestinal flora).
- Vitamin B6 (25-50 mg per day) is very effective in pregnancy nausea under doctor's supervision.
When Is Nausea Serious? Time to Go to the Doctor
If you have any of the following conditions, consult a healthcare provider without delay:
- Vomiting that lasts longer than 24 hours and leaves you unable to drink fluids
- Vomit that is bloody or looks like coffee grounds
- Nausea with severe abdominal pain
- High fever, stiff neck, severe headache
- Confusion, seizures
- Unintentional weight loss, jaundice, bruises on the skin
- Chest pain, nausea with left arm numbness (may be a heart attack)
Frequently Asked Questions (FAQ)
1. What causes nausea and how to get rid of it? The most common causes are stress, malnutrition, pregnancy, reflux and food poisoning. Eating ginger, mint-lemon, crackers, pressing the P6 point and drinking water slowly usually provides relief in 15-30 minutes.
2. What causes morning sickness?The most common causes of morning sickness are pregnancy, nocturnal reflux, low blood sugar and alcohol hangover. Stopping eating 3 hours before bedtime and sleeping with your head slightly elevated often solves the problem.
3. When does nausea start and end during pregnancy? Usually around the 5-6th week. Starts at week 12-14. decreases significantly per week. However, in 10-15% of women, it may continue after the 20th week or even until birth.
4. Does stress and anxiety cause nausea? Yes, it does so strongly. Intense stress stimulates the vagus nerve, stomach acid increases and a real feeling of nausea occurs. Even vomiting may occur during a panic attack.
5. Can nausea be a sign of a heart attack? Yes, especially in women, diabetics and the elderly, the first symptom of a heart attack may be just nausea, sweating and weakness instead of chest pain. If in doubt, call 112 without wasting any time.
