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Common GI Symptoms

BLOATING

What Is Bloating?

Bloating is the uncomfortable feeling of abdominal fullness, pressure, tightness, or trapped gas, sometimes with visible enlargement of the abdomen (distention).

Symptoms

  • Full, tight, or swollen abdominal sensation
  • Visible increase in abdominal size
  • Excess gas, burping, or flatulence
  • Discomfort after meals
  • Constipation, diarrhea, nausea, or incomplete evacuation

Overview

Bloating is common and can feel like the stomach is stretched or “inflated,” often worsening after meals and later in the day. It may occur with constipation, food intolerances, irritable bowel syndrome (IBS), functional dyspepsia, gastroparesis, or small intestinal bacterial overgrowth (SIBO). It is not always caused by excess gas; slowed motility, altered gut sensation, and how the diaphragm and abdominal wall respond can contribute. The gut-brain connection is important: stress can influence vagus nerve signaling, serotonin activity, gut sensitivity, and motility, making normal digestion feel uncomfortable.

Testing

Testing is individualized based on symptoms, bowel habits, medical history, and alarm features.

  • Hydrogen/Methane Breath Test: Evaluates SIBO and carbohydrate intolerance.
  • Celiac Blood Testing: Screens for celiac disease.
  • Gastric Emptying Study: Assesses delayed stomach emptying when nausea or vomiting is present.
  • Anorectal Manometry: Evaluates pelvic floor dysfunction with constipation or difficult evacuation.
  • Endoscopy Or Imaging: Considered for alarm symptoms, abnormal examination, or worsening symptoms.

Common Pharmacological Treatments

  • Rifaximin (Xifaxan): Used in selected cases of IBS-D or SIBO.
  • Linaclotide (Linzess) Or Plecanatide (Trulance): Can improve constipation-related bloating.
  • Prucalopride (Motegrity): Supports colonic motility in chronic constipation.
  • Dicyclomine (Bentyl): May reduce intestinal spasm and discomfort.
  • Amitriptyline (Elavil) Or Duloxetine (Cymbalta): Neuromodulators that may reduce gut sensitivity.

Common OTC Options

  • Simethicone (Gas-X, Phazyme): May help with gas-related pressure.
  • Peppermint Oil (IBgard): May reduce bloating and abdominal discomfort.
  • Alpha-Galactosidase (Beano): Helps digest gas-producing carbohydrates.
  • Lactase (Lactaid): Helps with lactose-containing foods.
  • Polyethylene Glycol 3350 (Miralax): May help when constipation contributes.

Diet And Lifestyle

  • Eat smaller meals and chew slowly.
  • Avoid carbonated drinks, gum, straws, and rapid eating, which increase swallowed air.
  • Keep a food-and-symptom diary.
  • Consider dietitian-guided low-FODMAP or targeted fructose/lactose reduction.
  • Common fermentable triggers: onions, garlic, wheat, rye, beans, lentils, asparagus, cauliflower, mushrooms, apples, pears, watermelon, honey, and high-fructose corn syrup.
  • Diaphragmatic breathing, GI psychology, and gut-directed hypnotherapy can help regulate the gut-brain connection.

Sources

  • AGA Clinical Practice Update On Evaluation And Management Of Belching, Abdominal Bloating, And Distention, American Gastroenterological Association, 2023.
  • Management Of Chronic Abdominal Distension And Bloating, Clinical Gastroenterology And Hepatology, 2021.
  • Abdominophrenic Dyssynergia: A Narrative Review, The American Journal Of Gastroenterology, 2023.

Abdominal Distention 

What Is Nausea?

Nausea is the uncomfortable feeling of being sick to your stomach or close to vomiting. It can be temporary or persistent and may reflect a digestive, neurologic, medication-related, metabolic, or gut-brain interaction.

Symptoms

  • Queasiness, unsettled stomach, or throat discomfort
  • Loss of appetite or food aversion
  • Retching or vomiting
  • Excess saliva, sweating, dizziness, or lightheadedness
  • Bloating, early fullness, reflux, or upper abdominal discomfort

Overview

Nausea may occur with viral illness, foodborne illness, reflux, migraine, motion sickness, pregnancy, medication effects, or constipation. Chronic nausea can occur with gastroparesis, functional dyspepsia, cyclic vomiting syndrome, or chronic nausea and vomiting syndrome. The vagus nerve and enteric nervous system constantly relay signals between the stomach, intestines, and brain. Changes in stomach motility, stress physiology, and visceral sensitivity can amplify these signals. Serotonin and dopamine are important chemical messengers in nausea pathways, which is why many nausea treatments target these systems.

Testing

Testing is guided by the timing, severity, associated symptoms, medication and substance use, and nutritional impact.

  • Blood Tests: Electrolytes, kidney and liver function, blood count, glucose, thyroid testing, and lipase when indicated
  • Upper Endoscopy: Evaluates inflammation, ulcers, narrowing, or obstruction
  • Gastric Emptying Study: Assesses for delayed stomach emptying
  • Abdominal Imaging: Evaluates gallbladder, pancreas, bowel obstruction, or other structural causes
  • Medication Review: Identifies treatments that may worsen nausea or slow motility

Common Pharmacological Treatments

  • Ondansetron (Zofran): Serotonin-targeting anti-nausea medication
  • Metoclopramide (Reglan Oral): Can support stomach motility and nausea control
  • Promethazine (Phenergan) Or Prochlorperazine (Compazine): Dopamine-targeting anti-nausea options
  • Mirtazapine (Remeron): Sometimes used for chronic nausea, appetite, and gut-brain symptoms
  • Aprepitant (Emend): Neurokinin-targeting option for selected persistent nausea patterns

Common OTC Options

  • Ginger: May reduce mild nausea for some people
  • Dimenhydrinate (Dramamine): Often used for motion-related nausea
  • Meclizine (Bonine): May help vestibular or motion-related nausea
  • Bismuth Subsalicylate (Pepto-Bismol): May help upset stomach or diarrhea-associated nausea
  • Phosphorated Carbohydrate Solution (Emetrol): Short-term nausea relief for some people

Diet And Lifestyle

  • Use small, frequent meals rather than large meals
  • Choose lower-fat foods when nausea is active, since fat can slow gastric emptying
  • Sip fluids regularly; oral rehydration solutions may help after vomiting
  • Identify patterns involving meals, stress, sleep, migraine, medications, or cannabis
  • Limit alcohol, nicotine, and strong food odors when these are triggers
  • Seek urgent evaluation for severe abdominal pain, blood in vomit, black stools, jaundice, confusion, dehydration, progressive swallowing difficulty, or unintended weight loss

Sources

  • Evaluation And Treatment Of Nausea And Vomiting In Adults, American Family Physician (2024).
  • A Practical 5-Step Approach To Nausea And Vomiting, Mayo Clinic Proceedings (2022).
  • Nausea And Vomiting In 2021: A Comprehensive Update, Journal Of Clinical Gastroenterology (2021). 

Nausea 

What Is Nausea?

Nausea is the uncomfortable feeling of being sick to your stomach or close to vomiting. It can be temporary or persistent and may reflect a digestive, neurologic, medication-related, metabolic, or gut-brain interaction.

Symptoms

  • Queasiness, unsettled stomach, or throat discomfort
  • Loss of appetite or food aversion
  • Retching or vomiting
  • Excess saliva, sweating, dizziness, or lightheadedness
  • Bloating, early fullness, reflux, or upper abdominal discomfort

Overview

Nausea may occur with viral illness, foodborne illness, reflux, migraine, motion sickness, pregnancy, medication effects, or constipation. Chronic nausea can occur with gastroparesis, functional dyspepsia, cyclic vomiting syndrome, or chronic nausea and vomiting syndrome. The vagus nerve and enteric nervous system constantly relay signals between the stomach, intestines, and brain. Changes in stomach motility, stress physiology, and visceral sensitivity can amplify these signals. Serotonin and dopamine are important chemical messengers in nausea pathways, which is why many nausea treatments target these systems.

Testing

Testing is guided by the timing, severity, associated symptoms, medication and substance use, and nutritional impact.

  • Blood Tests: Electrolytes, kidney and liver function, blood count, glucose, thyroid testing, and lipase when indicated
  • Upper Endoscopy: Evaluates inflammation, ulcers, narrowing, or obstruction
  • Gastric Emptying Study: Assesses for delayed stomach emptying
  • Abdominal Imaging: Evaluates gallbladder, pancreas, bowel obstruction, or other structural causes
  • Medication Review: Identifies treatments that may worsen nausea or slow motility

Common Pharmacological Treatments

  • Ondansetron (Zofran): Serotonin-targeting anti-nausea medication
  • Metoclopramide (Reglan Oral): Can support stomach motility and nausea control
  • Promethazine (Phenergan) Or Prochlorperazine (Compazine): Dopamine-targeting anti-nausea options
  • Mirtazapine (Remeron): Sometimes used for chronic nausea, appetite, and gut-brain symptoms
  • Aprepitant (Emend): Neurokinin-targeting option for selected persistent nausea patterns

Common OTC Options

  • Ginger: May reduce mild nausea for some people
  • Dimenhydrinate (Dramamine): Often used for motion-related nausea
  • Meclizine (Bonine): May help vestibular or motion-related nausea
  • Bismuth Subsalicylate (Pepto-Bismol): May help upset stomach or diarrhea-associated nausea
  • Phosphorated Carbohydrate Solution (Emetrol): Short-term nausea relief for some people

Diet And Lifestyle

  • Use small, frequent meals rather than large meals
  • Choose lower-fat foods when nausea is active, since fat can slow gastric emptying
  • Sip fluids regularly; oral rehydration solutions may help after vomiting
  • Identify patterns involving meals, stress, sleep, migraine, medications, or cannabis
  • Limit alcohol, nicotine, and strong food odors when these are triggers
  • Seek urgent evaluation for severe abdominal pain, blood in vomit, black stools, jaundice, confusion, dehydration, progressive swallowing difficulty, or unintended weight loss

Sources

  • Evaluation And Treatment Of Nausea And Vomiting In Adults, American Family Physician (2024). [1]
  • A Practical 5-Step Approach To Nausea And Vomiting, Mayo Clinic Proceedings (2022). [2]
  • Nausea And Vomiting In 2021: A Comprehensive Update, Journal Of Clinical Gastroenterology (2021). [3]

Sources:

  1. Evaluation and treatment of nausea and vomiting in adults. American Family Physician, 2024
  2. A practical 5-step approach to nausea and vomiting. Mayo Clinic Proceedings, 2022
  3. Nausea and vomiting in 2021: a comprehensive update. Journal of Clinical Gastroenterology, 2021

Vagus Nerve

What Is The Vagus Nerve?

The vagus nerve is a major communication pathway in the gut-brain connection, carrying signals between the brain, stomach, and intestines that influence digestion, sensation, appetite, and inflammation.

Symptoms

  • Nausea, vomiting, or feeling full quickly
  • Fullness or bloating after meals
  • Upper abdominal discomfort
  • Reflux or indigestion
  • Constipation or diarrhea
  • Abdominal pain related to bowel movements
  • Reduced appetite or altered hunger/fullness signals

Overview

The vagus nerve is part of the parasympathetic nervous system, often described as the “rest and digest” system. It works with the enteric nervous system, the nerve network within the GI tract, to coordinate stomach accommodation, gastric emptying, intestinal motility, secretion, and fullness signals. Most vagus nerve fibers carry information from the gut to the brain, including stretch, nutrients, inflammation, and nausea signals. Stress can shift the body toward a sympathetic “fight or flight” state, which may alter motility and increase gut sensitivity. Serotonin produced in the gut helps relay nausea and motility signals through vagal pathways; dopamine also participates in nausea signaling and GI motor control. Vagal dysfunction can contribute to symptoms in gastroparesis, functional dyspepsia, and disorders of gut-brain interaction, but symptoms alone do not prove vagus nerve damage.

Testing

There is no single routine test for vagus nerve dysfunction. Evaluation focuses on identifying the cause of symptoms and measuring GI motility or autonomic function.

  • Gastric Emptying Study: Measures how quickly food leaves the stomach.
  • Upper Endoscopy: Evaluates structural causes of upper GI symptoms.
  • Electrogastrography Or Body Surface Gastric Mapping: Assesses stomach electrical activity.
  • Autonomic Testing: May assess heart-rate variability and autonomic regulation.
  • Antroduodenal Manometry: Measures stomach and small-bowel contractions.

Common Pharmacological Treatments

Treatment targets the underlying GI condition rather than the vagus nerve alone.

  • Metoclopramide (Reglan Oral): Supports gastric motility in selected gastroparesis cases.
  • Domperidone: May improve nausea and gastric emptying where available.
  • Ondansetron (Zofran): Helps manage nausea.
  • Amitriptyline (Elavil) Or Duloxetine (Cymbalta): Neuromodulators sometimes used for visceral hypersensitivity.

Common Non-Pharmacological Options

  • GI Psychology, Hypnotherapy, Or Cognitive Behavioral Therapy
  • Diaphragmatic Breathing And Stress-Management Skills
  • Regular Physical Activity And Sleep Optimization
  • Dietitian Consultation
  • Nerva Digital App Or SynerGI Program
  • Noninvasive Vagus Nerve Stimulation: An emerging therapy with variable evidence by condition

Diet And Lifestyle

  • Eat smaller, more frequent meals.
  • Avoid rushing meals; chew thoroughly.
  • Keep a symptom, meal, and stress diary.
  • Limit high-fat meals if fullness or nausea is prominent.
  • Avoid lying down immediately after eating.
  • Use slow breathing before and after meals to support relaxation.

Sources

Disclaimer: The information on this website is for educational purposes only. Always Talk to your medical provider for individualized guidance and support for personal medical concerns. 

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