
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.
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.
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:
| CAUSES | DESCRIPTION |
| 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. |
While short-term nausea, and vomiting are often harmless, prolonged or severe episodes can lead to complications, including:
Certain symptoms accompanying nausea and vomiting warrant immediate medical attention, including:

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:
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:
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:
| CONDITION | DESCRIPTION | TREATMENT |
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. |
Mild nausea often improves with simple self-care measures, such as:
If vomiting occurs, you can manage it at home by:

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.
Nausea and vomiting can affect people of all age groups, but some are more prone than others:
Prevention depends on the cause. However, here are a few helpful strategies:
You can sometimes ease or delay the urge to vomit, but this depends on the underlying cause. Some strategies include:
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:
Nausea is a specific sensation, usually described as:
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.
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 recovery time varies depending on the cause:
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.

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