Nausea After Eating: Causes, Treatment & Prevention

Nausea is an uneasy feeling in the stomach, often with an urge to vomit. Vomiting is when stomach contents are forced up and out through the mouth. Nausea can happen with or without vomiting.

Nausea after eating can point to many causes, such as food poisoning, reflux, gallbladder disease or overeating. When the nausea starts after a meal, and what other symptoms come with it, can help a doctor narrow down the cause. Causes also vary with age.

Nausea After Eating

In children, nausea is often due to stomach infections or food poisoning. In adults, common causes include reflux, gastritis, food poisoning and infections such as salmonella.

Nausea is also one of the most common symptoms of early pregnancy. Pregnancy hormones are thought to play a major role.

What Are The Causes Of Nausea After Eating?

Nausea after eating is not a disease, but a symptom of something else. Possible causes include:

Food intolerance or allergies
Acid reflux (GERD)
Motion sickness
Emotional stress
Gallbladder disease
Severe pain in any part of the body
Food poisoning
Overeating
Medicines, including some diabetes and weight-loss drugs
Infections
Slow stomach emptying (gastroparesis)
Heart attack
Brain tumor
Ulcers
Brain trauma
Cancers
Appendicitis
Bowel obstruction
Bulimia or other eating disorders
Early trimester of pregnancy (nausea is very common in early pregnancy)
A reaction to certain strong smells or odors
Drinking too much alcohol

How The Digestive System Works, How Food Is Digested?

The digestive system is a group of organs that work together to break down what you eat and drink. Digestion starts in the mouth, where chewing breaks food into small pieces so it can be swallowed. Muscle contractions (peristalsis) then move the food down the esophagus into the stomach.

Carbohydrates, proteins and fats are broken down into nutrients. The body uses them for energy or stores them for later.

The stomach makes acid and enzymes, and the hormone Gastrin tells it to release acid. When food moves into the small intestine, hormones such as secretin and cholecystokinin trigger bile and pancreatic juices to finish digestion and absorb nutrients. What isn’t absorbed passes into the large intestine and leaves the body as stool.

A problem anywhere along this process can cause nausea after eating. That is why the timing of the nausea and the symptoms that come with it matter.

Associated Symptoms of Nausea

Nausea or vomiting can come with other symptoms, depending on the cause. They may include

Fatigue
Stomach Pain
Vomiting
Diarrhea
Fever
Loss of appetite
Weight loss
Heartburn
Bloating or gas
Chest discomfort
Body aches

How Nausea After Eating Can Be Diagnosed?

The causes of nausea are wide-ranging. Your doctor will ask when the nausea starts, what you ate and what other symptoms you have.

Depending on the suspected cause, a doctor may order

Blood tests
Urine tests (including a pregnancy test)
Allergy skin tests
Swallowing tests
A colonoscopy or upper endoscopy
An ultrasound, CT scan or MRI of the abdomen

When to See a Doctor

Occasional nausea after a big or rich meal is usually not serious. But nausea that keeps coming back, or comes with other symptoms, needs to be checked.

According to MedlinePlus, call 911 or go to the emergency room if you think vomiting is from poisoning, or if you see blood or dark, coffee-ground material in the vomit. Contact a provider right away if:

Vomiting lasts longer than 24 hours
You can’t keep fluids down for 12 hours or more
You vomit 3 or more times in one day
You have a headache or stiff neck
You haven’t urinated in 8 hours or more
You have severe belly pain

Nausea with chest pain, shortness of breath or sweating can be a sign of a heart attack. Call 911.

Children need extra attention because they dehydrate faster. Call your pediatrician if

Your child is under 6 months and is vomiting
Your child is vomiting and has a high fever
Your child keeps vomiting for more than a few hours or can’t keep fluids down
Your child’s vomit contains blood
Your child has severe or lasting belly pain
Your child is losing weight
Your child has a bad headache or stiff neck
Your child has not urinated in 8 hours

How It Can Be Treated?

Treatment depends on the cause of nausea after eating.

People with GERD or heartburn may need acid-reducing medicine. If tests find the stomach bacteria H. pylori, antibiotics are used to treat it.

People with food allergies or intolerances should avoid the foods that trigger symptoms.

Most cases of food poisoning are mild, and drinking plenty of fluids is the main treatment. See a doctor for bloody diarrhea, diarrhea lasting more than 3 days or a fever over 102°F. Antibiotics are only used for some bacterial infections, when a doctor prescribes them.

In the case of a stomach virus, people should stay hydrated and avoid foods that make the nausea worse.

For gallbladder disease that keeps causing symptoms, surgery to remove the gallbladder is often recommended.

Prevention

Healthy eating habits can help prevent some nausea after eating. Tips include

Eat lightly when you feel nauseated
Keep sipping small amounts of fluids
Choose bland, easy-to-digest foods such as rice, toast or crackers
Limit greasy, spicy or very rich foods
Take a gentle walk after meals instead of lying down
Try ginger, which may ease mild nausea
Eat small, more frequent meals
Avoid alcohol and junk food
Handle, cook and store food safely to prevent food poisoning

HP Thoughts: You might suspect that you are experiencing an upset stomach or having colic leading you to expel what you ate. It could be something worse, though: Gastrointestinal Bleeding.