Acid reflux can occur after eating a large or heavy meal or lying down soon after eating. It happens when stomach acid flows back into the esophagus, leading to heartburn and other symptoms. Occasional acid reflux can usually be handled with home care, but chronic acid reflux – known as GERD – may require medical treatment. Over time, GERD can damage the tissues of the esophagus.
Overview
Normally, food and stomach contents should only move downward through the digestive system. Acid reflux happens when stomach acid moves upward into the esophagus or throat.
When stomach acid reaches areas where it doesn’t belong, it irritates and inflames the lining of the esophagus, which is the tube connecting the stomach to the throat.
Most people experience acid reflux occasionally. It can feel like:
- Indigestion (burning stomach pain after eating)
- Heartburn (burning pain in the chest near the breastbone)
Occasional reflux is uncomfortable but not considered a disease. However, frequent reflux can affect daily life and damage tissues.
GERD Explained
GERD (gastroesophageal reflux disease) is long-term, chronic acid reflux. It is usually diagnosed when reflux happens at least twice a week for several weeks.
While temporary reflux can be caused by short-term conditions, GERD is usually due to ongoing mechanical problems where the body fails to prevent stomach acid from entering the esophagus.
Causes & Contributing Factors
Acid reflux happens when stomach acid passes through the lower esophageal sphincter (LES), the muscle valve that normally keeps stomach contents from moving backward. GERD develops when this protective system fails repeatedly or permanently. Several conditions can weaken the LES directly, change its position, or increase pressure on it.
Hiatal Hernia
A hiatal hernia occurs when the upper part of the stomach pushes upward through the diaphragm opening (hiatus) where the esophagus normally passes.
This contributes to reflux in several ways:
- Mechanical compression: The stomach and esophagus become crowded together in the chest cavity, making it easier for acid to move upward.
- Loss of diaphragm support: Normally, the diaphragm helps reinforce the LES. When the LES moves above the diaphragm, it loses that support.
- Acid trapping: The hernia can create a pocket where acid collects, increasing reflux risk.
Hiatal hernias are very common, especially with aging, and often develop gradually. As they enlarge over time, reflux symptoms may worsen.
Pregnancy
Pregnancy causes reflux through both hormonal and mechanical mechanisms.
Hormonal effects
- High levels of relaxin relax smooth muscles throughout the body, including the LES.
- Increased estrogen and progesterone may also reduce LES tone.
Mechanical effects
- The growing uterus increases abdominal pressure.
- This pressure pushes stomach contents upward toward the LES.
Pregnancy-related reflux is usually temporary and improves after delivery.
Obesity
Excess body weight contributes through multiple pathways:
Increased abdominal pressure
- More pressure pushes stomach contents upward against the LES.
Long-term muscle strain
- Unlike pregnancy, obesity often persists for years, potentially causing permanent weakening of LES and diaphragm muscles.
Hormonal effects
- Fat tissue produces estrogen, which may contribute to LES relaxation.
Association with hiatal hernia
- Obesity increases the likelihood of developing hiatal hernias, which further increases reflux risk.
Smoking
Smoking worsens reflux through several mechanisms:
Direct LES relaxation
- Tobacco chemicals reduce LES muscle tone.
Coughing effects
- Chronic cough repeatedly forces the LES open.
- Repeated strain can weaken diaphragm support muscles.
Acid production changes
- Smoking increases stomach acid production.
Delayed stomach emptying
- Slower digestion means stomach contents remain longer, increasing reflux opportunities.
Secondhand smoke can also contribute, though usually less strongly.
Medications
Some medications relax the LES or increase reflux risk indirectly.
These include:
- Benzodiazepines – relax smooth muscle
- Calcium channel blockers – reduce muscle contraction strength
- Tricyclic antidepressants – can reduce LES tone
- NSAIDs (like aspirin, ibuprofen) – may irritate the digestive tract
- Theophylline – relaxes smooth muscle
- Hormone therapy medications – may mimic pregnancy-like hormone effects
Structural or Medical Conditions
Birth defects
- Conditions such as esophageal malformations or congenital hernias can disrupt normal reflux prevention.
Connective tissue diseases
- Diseases affecting muscle and connective tissue can weaken esophageal muscle strength and coordination.
Prior surgery
- Chest or upper abdominal surgery may damage nerves or structures involved in LES function.
Symptoms
Common symptoms include:
- Regurgitation: Food, acid, or liquid flowing back into the throat with a sour taste
- Burning sensation: In the chest (heartburn) or upper stomach (acid indigestion)
- Chest pain not related to the heart
- Nausea or reduced appetite
- Sore throat or a feeling of a lump in the throat
- Difficulty swallowing
- Chronic cough, wheezing, or breathing problems (similar to asthma)
Symptoms may worsen:
- At night or when lying down
- After fatty or large meals
- After bending over
- After smoking or drinking alcohol
GERD in Babies
Some spitting up is normal in infants. GERD is more serious and may cause feeding problems or distress.
Possible signs in babies:
- Excessive crying or fussiness
- Sleep problems
- Refusal to feed
- Frequent small vomiting episodes
- Hoarseness or wheezing
- Bad breath
Food Triggers
Foods alone usually don’t cause reflux but can worsen it, including:
- Chocolate
- Coffee
- Alcohol
- Mint
- Garlic
- Onions
Fatty foods increase acid production and digest slowly, increasing reflux risk.
Possible Complications
Untreated GERD can lead to:
- Esophagitis: Inflammation of the esophagus
- Barrett’s esophagus: Tissue changes increasing cancer risk
- Esophageal stricture: Narrowing from scar tissue
- Laryngopharyngeal reflux: Acid reaching the throat
- Asthma-like symptoms: From acid entering the airways
Diagnosis
A gastroenterologist may diagnose GERD using:
- Esophagram: X-ray imaging while swallowing barium
- Upper endoscopy: Camera exam of the esophagus
- Esophageal pH monitoring: Measures acid levels
- Esophageal manometry: Measures muscle activity
Treatment
Home Management
- Eat smaller meals
- Eat dinner earlier
- Sleep on the left side (The stomach sits lower than the esophagus in this position)
- Wear loose clothing
- Lose weight if needed
- Stop smoking
- Keep antacids available if triggers are expected
Medications
Over-the-Counter Options
- Antacids such as Rennie®, or Maalox®
- Alginates (often combined with antacids) such as Gaviscon®
Prescription Medications
- H2 blockers (reduce acid production)
- Proton pump inhibitors (PPIs) are highly effective and help with healing
- Baclofen may reduce LES relaxation in some cases
Procedures and Surgery
Surgery is usually reserved for patients with severe, treatment-resistant GERD or when complications arise, and it is typically effective in reducing reflux and preventing further damage.
Your gastroenterologist will refer you to a general surgeon to discuss the following operations:
Fundoplication Surgery
The upper stomach is wrapped around the lower esophagus to strengthen the valve.
Magnetic Ring Device (LINX-type procedures)
Helps keep the stomach and esophagus junction closed.
Outlook
Many people control mild reflux with lifestyle changes. Moderate to severe cases often require medication. A gastroenterologist can monitor for complications and guide treatment.
Surgery is usually reserved for severe or treatment-resistant GERD, but is generally effective.
During an Acid Reflux Episode
- Stand or sit upright
- Sip small amounts of water
- Loosen tight clothing
- Take an antacid or alginate if available
When to See a Doctor
See a gastroenterologist if reflux happens frequently or interferes with daily life. Even mild symptoms can sometimes cause hidden damage, and GERD is treatable.