Nausea and Vomiting

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Nausea, and vomiting are common symptoms. However, persistent nausea, and vomiting will require medical evaluation as it could be symptoms of more severe underlying conditions.

Nausea refers to the unpleasant sensation of wanting to vomit, while vomiting is the forceful expulsion of stomach contents through the mouth. These are symptoms, not diseases, meaning they often signal an underlying condition.

Nausea, and vomiting can stem from a wide range of causes, including from minor digestive disturbances to serious medical conditions requiring immediate attention. They are common symptoms experienced by people of all ages. In some cases, they resolve on their own. 

However, persistent or severe nausea, and vomiting could indicate more serious problems, such as gastrointestinal obstructions, infections or surgical conditions.

What is Nausea and Vomiting?

Nausea is a distressing sensation felt in the stomach or throat, often preceding vomiting. Vomiting, on the other hand, is the physical act of forcefully expelling stomach contents through the mouth. 

While they often occur together, it is possible to experience nausea without vomiting.

Both symptoms are part of the body’s protective mechanisms, triggered when the brain detects a potential threat. These threats include toxins, infections or physical obstructions, which triggers the body’s need to have them removed or avoided.

What causes Nausea and Vomiting?

Nausea, and vomiting arise from many potential causes, which can range from minor temporary disturbances to serious medical emergencies. Some of the common causes include:

CAUSESDESCRIPTION
Digestive System Issues
Acid Reflux or Gastritis
Acid reflux, also known as gastro-oesophageal reflux disease or GERD, occurs when stomach acid flows back into the oesophagus, irritating its lining. This can cause a sensation of nausea, particularly after meals.
Gastritis, which refers to inflammation of the stomach lining, can also trigger nausea and vomiting, especially if caused by infections (like H. pylori) or excessive alcohol or medication use (such as NSAIDs).
Bowel Obstruction
A bowel obstruction occurs when the passage of food or waste through the intestines is blocked. This could result from adhesions (scar tissue), tumours, hernias or twisting of the bowel. As food and fluids build up behind the obstruction, nausea and vomiting occur, often accompanied by severe abdominal pain, bloating, and constipation.
Food Poisoning
Food poisoning occurs when you consume contaminated food or beverages containing bacteria (such as Salmonella or E. coli), viruses or toxins. These harmful substances irritate the digestive tract, triggering nausea and vomiting within a few hours after eating. Other symptoms often include diarrhoea, abdominal cramps, and fever.
Gastroenteritis (Stomach Flu)
Gastroenteritis, also commonly known as food poisoning, refers to inflammation of the stomach and intestines, usually caused by a viral or bacterial infection. Unlike a typical Food Posioning episode, gastroentritis can present with only vomiting and nausea and gastric pain without diarrhoea symptoms. 
Common culprits include norovirus and rotavirus. The infection stimulates the digestive tract’s nerve endings and the brain’s vomiting centre, resulting in nausea, vomiting, diarrhoea, and abdominal discomfort.
Ear and Balance Disorders
Motion Sickness
Motion sickness arises when there is a mismatch between what your eyes see, and what your inner ear senses regarding motion. This confusion in the brain can lead to nausea, cold sweats, dizziness, and vomiting. Travelling by car, boat or plane are common triggers, especially in individuals who are particularly sensitive to movement.
Vertigo or Inner Ear Infections
Inner ear infections (like labyrinthitis or vestibular neuritis) affect the balance system within the ear, leading to dizziness, spinning sensations (vertigo), and nausea. When balance signals from the inner ear are disrupted, the brain’s vomiting centre may be activated, causing vomiting as well.
Neurological Causes
Concussion or Head Injury
Nausea and vomiting are common symptoms following a concussion, which is a type of traumatic brain injury. The brain’s vomiting centre can be stimulated by direct injury, swelling or disruption in balance signals. These symptoms may appear immediately after the injury or develop hours later.
Increased Intracranial Pressure
Conditions that increase pressure inside the skull, such as brain tumours, bleeding or severe infections like meningitis, can compress areas of the brain responsible for nausea and vomiting. These cases are serious, and often accompanied by headaches, visual changes or confusion.
Migraines
Severe headaches, particularly migraines, frequently trigger nausea, and vomiting. This is believed to be related to abnormal brain activity that affects both the gastrointestinal tract, and the brainstem vomiting centre. In some cases, nausea may even appear before the headache, serving as a warning sign (aura).
Systemic and Infections
Medication Side Effects
Many medications can trigger nausea, and vomiting either by directly irritating the stomach lining or by acting on the brain’s vomiting centre. Some of the common culprits include:Antibiotics.Anaesthesia medications.Chemotherapy drugs.Painkillers (opioids).
Morning Sickness During Pregnancy
During early pregnancy, hormonal changes, particularly the surge in human chorionic gonadotropin (hCG), can stimulate the vomiting centre in the brain, resulting in nausea, and vomiting. Known as morning sickness, this can occur at any time of day, and is particularly common in the first trimester.
Viral Infections
Viral infections, whether affecting the digestive tract, respiratory system or nervous system, can stimulate nausea, and vomiting as part of the body’s response. Infections like influenza often cause systemic symptoms, including fever, muscle aches, nausea, and occasional vomiting, particularly in children.
Surgical Conditions
Appendicitis
Appendicitis is inflammation of the appendix, often caused by obstruction or infection. It typically presents with nausea, vomiting, and pain that starts near the belly button, and shifts to the lower right abdomen. Vomiting in appendicitis tends to occur after the pain develops.
Gallbladder Disease
Gallbladder issues, such as gallstones or cholecystitis (inflammation of the gallbladder), can lead to nausea, and vomiting, particularly after consuming fatty meals. This is because the gallbladder plays a key role in digesting fats, and inflammation or blockage can trigger significant discomfort.
Intestinal Obstruction
In addition to bowel obstruction discussed earlier, certain surgical conditions, such as post-surgical adhesions or hernias, can physically block the intestines, preventing food, and fluid from passing through. This results in persistent nausea and vomiting along with abdominal bloating and pain.
Psychological Triggers
Anxiety and Stress
The brain, and gut are closely connected through the gut-brain axis, meaning psychological distress can directly affect the digestive system. When anxious or stressed, your body triggers the ‘fight or flight’ response, which slows digestion, and stimulates nausea. This is why many people feel nauseous before public speaking or during a panic attack.
Phobias and Trauma
Some people experience nausea or vomiting in response to specific triggers, such as seeing blood, unpleasant smells or traumatic memories. In such cases, the vomiting centre in the brain is stimulated by emotional stress, rather than physical illness.

Are there any possible complications of Nausea and Vomiting?

While short-term nausea, and vomiting are often harmless, prolonged or severe episodes can lead to complications, including:

  • Aspiration pneumonia – inhaling vomit into the lungs, which can cause serious respiratory infections.
  • Dehydration – loss of fluids, and electrolytes, particularly in children, elderly individuals or those with chronic illness.
  • Delayed diagnosis – chronic nausea and vomiting could mask serious underlying conditions, delaying appropriate treatment.
  • Nutritional deficiencies – inability to retain food can lead to malnutrition over time.
  • Oesophageal injury – repeated vomiting can irritate or tear the oesophagus, potentially causing bleeding.

What are the warning signs that demand medical attention?

Certain symptoms accompanying nausea and vomiting warrant immediate medical attention, including:

  • Blood in vomit (haematemesis).
  • High fever.
  • Severe headache or stiff neck.
  • Severe or persistent abdominal pain.
  • Signs of dehydration, such dry mouth, reduced urination, dizziness.
  • Sudden onset vomiting with severe chest pain or difficulty breathing.
  • Vomiting that lasts more than 24 hours.
  • Vomiting after a head injury.

How do doctors diagnose Nausea and Vomiting?

Doctors often perform a physical examination, and assess accompanying symptoms to provide patients with an accurate diagnosis.

At Alpine Surgical Practice, diagnosis begins with a thorough medical history, and symptom review. This is then followed by a physical examination. Additionally, the doctor will also assess factors such as the frequency, duration, and triggers of the symptoms.

To identify the underlying cause, the doctor may recommend further tests, including:

  • Blood tests to detect infections, inflammation or metabolic disturbances.
  • Imaging studies such as ultrasound, X-ray or CT scan to evaluate the digestive tract.
  • Endoscopy to assess the oesophagus, stomach, and upper intestine for structural issues.
  • Specialist referrals if the symptoms relate to neurological or balance disorders.

How do doctors usually treat Nausea and Vomiting?

Once our doctors have a thorough understanding of your symptoms, and conditions, they will begin formulating a personalised treatment plan. The treatment may include one or a combination of the following options:

Conservative Management

  • Dietary adjustments — eating bland foods, avoiding fatty or spicy meals, and consuming smaller, more frequent meals.
  • Hydration — encouraging fluid intake to prevent dehydration.

Medications

  • Anti-nausea drugs (antiemetics).
  • Antacids or medications to reduce stomach acid.
  • Antibiotics for bacterial infections.
  • Intravenous fluids for severe dehydration.

Surgical Treatment

In some cases, nausea, and vomiting are caused by serious underlying conditions that require surgical treatment. This is especially true when the symptoms stem from structural problems, inflammation, infection or blockages within the digestive tract.

Some examples of such conditions, along with the types of surgeries that may be required are:

CONDITIONDESCRIPTIONTREATMENT

Appendicitis

Appendicitis occurs when the appendix becomes inflamed, and infected, leading to nausea, vomiting, abdominal pain (usually starting near the belly button, and shifting to the lower right side), and sometimes fever.

Surgical Procedure: Appendicectomy
This surgery involves removing the inflamed appendix before it perforates, which could cause life-threatening complications like peritonitis, which is an infection of the abdominal lining.
An appendicectomy can be performed either as:Laparoscopic appendicectomy – minimally invasive surgery using small incisions and a camera.Open appendicectomy – performed through a larger incision, typically in cases of severe infection or rupture.

Gallstones and Gallbladder Disease

Gallstones can block the bile ducts, leading to inflammation (cholecystitis), and severe nausea, vomiting, and upper abdominal pain, particularly after eating fatty meals.

Surgical Procedure: Cholecystectomy
This involves removing the gallbladder, usually performed laparoscopically (keyhole surgery). In cases of severe infection or if laparoscopic surgery is not suitable, an open cholecystectomy may be performed.Laparoscopic cholecystectomy preferred option for most patients, with smaller incisions and faster recovery.Open cholecystectomy reserved for complex cases with significant inflammation or scarring.

Intestinal Obstruction

A blockage in the intestines prevents food, fluids, and gas from passing normally through the digestive tract. This can lead to persistent vomiting, bloating, and severe pain. Some of the causes can include:Adhesions (scar tissue from previous surgery).Hernias (protrusion of bowel through weak spots in the abdominal wall).Intussusception (a segment of bowel sliding into itself).Tumours.Volvulus (twisting of the bowel).

Surgical Procedures: Bowel Resection or Adhesiolysis
Bowel resection if part of the intestine is diseased, the affected section is surgically removed, and the healthy ends are reconnected.Adhesiolysis if adhesions are causing the obstruction, these are surgically cut to free the bowel. This can be done laparoscopically or through open surgery, depending on the extent of the adhesions.Hernia repair if a hernia is the cause, surgery is performed to push the bowel back into place, and reinforce the abdominal wall, sometimes using mesh.

Peptic Ulcer Complications

In severe cases, stomach ulcers can perforate or cause gastric outlet obstruction, leading to severe vomiting and inability to keep food down.

Surgical Procedures: Ulcer SurgeryGastric perforation repair for perforated ulcers, emergency surgery is needed to seal the hole, and clean the abdominal cavity to prevent infection.Partial gastrectomy in some cases, part of the stomach may need to be removed if extensive damage is present.

Gynaecological Causes

Sometimes, nausea and vomiting can be linked to gynaecological emergencies, such as ovarian torsion or ruptured ovarian cysts.

Surgical Procedures: Ovarian SurgeryOvarian cystectomy removal of large or ruptured ovarian cysts.Oophorectomy removal of the ovary if the damage is severe, such as in ovarian torsion.

Peritonitis

If any of the above conditions lead to perforation of the stomach, bowel, or appendix, the abdominal cavity can become infected, causing a condition known as peritonitis. This causes intense nausea, vomiting, fever, and severe abdominal pain.

Surgical Procedure: Emergency Laparotomy
This is an open abdominal surgery performed to identify and repair the source of the infection, drain infected fluids, and wash out the abdominal cavity.

How can I manage Nausea at home?

Mild nausea often improves with simple self-care measures, such as:

  • Avoiding strong smells or overly sweet foods.
  • Eating small, light meals instead of heavy or greasy foods.
  • Resting in a sitting or semi-upright position to ease stomach discomfort.
  • Sipping clear fluids like water or electrolyte drinks.
  • Using over-the-counter remedies, if recommended by your doctor.

How can I manage Vomiting at home?

If vomiting occurs, you can manage it at home by:

  • Avoiding triggers — identify and avoid foods, smells, or movements that provoke vomiting.
  • Gradual reintroduction of foods start with bland foods like toast, crackers, or rice when vomiting stops.
  • Resting your stomach — avoid eating solid foods until vomiting settles.
  • Staying hydrated sip fluids slowly to prevent dehydration. Oral rehydration solutions may help.

Summary

It is important to seek immediate medical attention if symptoms persist, so that you will receive proper treatment.

Nausea, and vomiting are common symptoms, but they can sometimes signal serious underlying conditions that require professional medical attention. Recognising warning signs, and seeking timely care can prevent complications, and ensure appropriate treatment.

At Alpine Surgical Practice, we provide comprehensive diagnosis, and tailored treatments for patients experiencing persistent or severe nausea and vomiting. 

Our team will work closely with you to identify the cause, and recommend the most suitable treatment plan. Book a consultation with us today for a detailed diagnosis and personalised treatment plan. 

Frequently Asked Questions

Which age group is more susceptible to nausea and vomiting?

Nausea and vomiting can affect people of all age groups, but some are more prone than others:

  • Children, and infants often experience nausea, and vomiting due to infections, food intolerance or motion sickness.
  • Pregnant women, especially during the first trimester, frequently experience nausea, and vomiting due to hormonal changes.
  • Older adults may also be more susceptible, especially if they have underlying medical conditions, are taking medications that irritate the stomach or have balance issues affecting the inner ear.

Is it possible to prevent nausea?

Prevention depends on the cause. However, here are a few helpful strategies:

  • Avoid triggers such as strong odours, greasy foods, and motion if you are prone to travel sickness.
  • Eat smaller meals at regular intervals to avoid an overly full stomach, which can trigger nausea.
  • For those with a history of migraines or acid reflux, work with your doctor to manage these conditions to reduce nausea episodes.
  • If prone to motion sickness, consider anti-nausea medication or wearing acupressure wristbands.
  • Manage stress through relaxation techniques, as anxiety can sometimes lead to nausea.
  • Stay hydrated by sipping water or clear fluids throughout the day.

Is it possible to suppress the urge to vomit?

You can sometimes ease or delay the urge to vomit, but this depends on the underlying cause. Some strategies include:

  • Deep, slow breathing to calm your stomach, and nerves.
  • Distracting yourself with calming activities can sometimes help if the nausea is linked to anxiety.
  • Sipping small amounts of cold water or sucking on ice chips.
  • Sitting upright, and avoiding lying down, which can worsen nausea in some cases.
  • Using ginger-based remedies like ginger tea or ginger chews, known for their anti-nausea properties.

Is feeling nauseous after eating a concern?

It can be a concern, especially if it happens frequently or is accompanied by other symptoms like pain, bloating, diarrhoea or vomiting. Some of the common causes of post-meal nausea include:

  • Acid reflux or gastritis.
  • Food intolerances or allergies.
  • Gallbladder issues.
  • Gastroparesis.
  • Overeating or eating too quickly.

How do I know if I am feeling nauseous or just unwell?

Nausea is a specific sensation, usually described as:

  • Feeling queasy, unsettled or uncomfortable in the stomach.
  • Having the urge to vomit or a sense that vomiting might occur soon.
  • Sometimes accompanied by excessive saliva production, sweating, dizziness or loss of appetite.

Feeling "unwell" is a broader term, and may include fatigue, body aches, headache, fever or general discomfort, which could suggest a viral infection, stress, or other illness. If you are uncertain, especially if symptoms persist or worsen, it is best to seek medical advice.

Why do I vomit but nothing comes up?

This is known as dry heaving or retching, where your body goes through the motions of vomiting but no actual stomach contents are expelled. This can happen when:

  • The stomach is empty, such as after prolonged vomiting.
  • Intense irritation, such as from reflux or certain medications, stimulates the gag reflex without significant stomach contents.
  • Psychological triggers, like extreme stress or anxiety, can also lead to dry heaving.
  • Severe nausea triggers the vomiting reflex even if there is nothing to bring up.

How long does it take to recover from nausea and vomiting?

The recovery time varies depending on the cause:

  • Mild cases caused by motion sickness, overeating, or mild anxiety can resolve within a few hours.
  • Food poisoning or stomach flu may cause symptoms that last 24 to 48 hours, though mild nausea may linger for a few more days.
  • If linked to chronic conditions like acid reflux, migraines or inner ear disorders, symptoms may come, and go over weeks or months until the underlying cause is treated.
  • Post-surgical nausea (from anaesthesia or medications) typically improves within a few hours to a day.

Be that as it may, staying hydrated, resting, and following medical advice can help speed up recovery. If nausea, and vomiting persist beyond 48 hours or if you show signs of dehydration, then a medical examination is recommended.

How can we help you?

We offer a comprehensive range of consultations for all General Surgical and Abdominal issues.

Let us know how we can help you.

Dr Aaron Poh

MBBS (Singapore), MRCS (Edinburgh), FRCS (Edinburgh), Master of Medicine (Surgery)

Comprehensive Colorectal Care, From Screening to Surgery.

This article has been medically reviewed by Dr Aaron Poh

Dr Aaron Poh is a Colorectal and General Surgeon with extensive experience in minimally invasive (keyhole) surgery. He performs a wide range of procedures including gastroscopy, colonoscopy, and advanced endoscopic treatments such as complex polyp removal with EMR and colonic stenting. His surgical expertise covers colorectal cancer surgery, hernia repair, gallbladder removal, as well as proven treatments for haemorrhoids and other anal conditions.
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