Functional Dyspepsia: Symptoms, Causes & Treatment

Functional dyspepsia (FD) is a common gastrointestinal disorder characterized by pain or discomfort and early fullness after eating, without any visible organic lesions on endoscopy or imaging. It differs from peptic ulcer disease or GERD in that no structural abnormality is detected, classifying it as a functional gastrointestinal disorder.

Approximately 20-40% of the global population experiences functional dyspepsia symptoms at some point in their lives. In the Middle East and Jordan specifically, prevalence rates are rising due to increased stress, psychological factors, and fast-food consumption patterns. Although significantly affecting quality of life, FD is not life-threatening.

The underlying mechanisms include impaired gastric motility (delayed gastric emptying), heightened gastric sensitivity to normal distension, and abnormal gut-brain signaling. Psychological stress, anxiety, and H. pylori infection play significant roles in symptom exacerbation and persistence.

Symptoms of functional dyspepsia vary between individuals and may be intermittent or continuous. Symptoms typically appear shortly after eating or within hours. Women often report more severe and frequent symptoms compared to men, particularly during periods of stress or hormonal changes.

• Epigastric Pain or Burning: Sharp or dull pain in the upper abdomen, resembling heartburn but unrelated to acid reflux.
• Early Satiety: Feeling full quickly even when eating small food amounts.
• Bloating and Gas: Accumulation of gas causes discomfort and visible abdominal distension.
• Nausea: Often accompanies large or fatty meals.
• Vomiting (Rare): Occurs in severe cases.
• Excessive Belching: Frequent air expulsion from the stomach.
• Constipation or Diarrhea: May accompany upper GI symptoms.
• Loss of Appetite: Fear of eating due to symptom anticipation.
• Post-prandial Discomfort: Symptoms typically last 30 minutes to several hours after meals.
• Fatigue and Lethargy: May result from poor nutrition or sleep disturbances.

• Delayed Gastric Emptying: Impaired stomach muscle contractions slow food passage into the small intestine, causing fullness and bloating.
• Visceral Hypersensitivity: Abnormal sensitivity to normal stomach stretching and pressure even with small food amounts.
• H. pylori Infection: May cause mild stomach lining inflammation affecting motility; symptoms may persist after treatment.
• Psychological Stress and Anxiety: Directly affects brain-gut signaling, exacerbating symptoms through the enteric nervous system.
• Low-Grade Inflammation: Mild inflammatory response in stomach lining without visible lesions on endoscopy.
• Gut Dysbiosis: Imbalance in beneficial gut bacteria affecting digestion and intestinal motility.
• Hormonal Disturbances: Such as dopamine deficiency or serotonin level alterations in the GI tract.

• Female Gender: Women are 1.5 times more likely to develop FD, possibly due to hormonal factors.
• Age: Most common in young to middle-aged adults (20-50 years), but can occur at any age.
• Chronic Psychological Stress and Anxiety: One of the strongest risk factors, especially in high-paced societies.
• Depression: Patients with depression experience more severe symptoms.
• Family History: Genetic or behavioral factors may increase susceptibility.
• Fatty and Spicy Foods: Exacerbate symptoms in susceptible individuals.
• Excessive Caffeine and Alcohol: Irritate the stomach lining.
• Smoking: Impairs gastric motility and protective mechanisms.
• Regular NSAID Use: Medications like ibuprofen may cause gastric irritation.
• Previous H. pylori Infection: Symptoms may persist even after successful eradication in some patients.

Diagnosis of functional dyspepsia is primarily clinical, based on Rome IV Criteria symptoms, after excluding organic diseases. No specific blood test or imaging definitively confirms FD, but investigations may rule out other conditions.

• Clinical History and Physical Examination: Detailed symptom assessment regarding onset, duration, and triggers. Physical exam is typically normal.
• Upper Endoscopy (EGD): Gold standard to exclude peptic ulcer, esophagitis, and malignancy. Normal mucosa confirms functional diagnosis.
• H. pylori Testing: Via urea breath test, stool antigen, or gastric biopsy during endoscopy. Positive results may explain symptoms.
• Routine Blood Tests: Complete blood count (CBC), liver function tests (LFTs), renal function tests (RFTs), and electrolytes. Normal ranges: Hemoglobin 12-16 g/dL (women), 13.5-17.5 g/dL (men).
• Abdominal Ultrasound: Evaluates gallbladder, pancreas, and liver; ordered if other conditions suspected.
• Gastric Emptying Study: May be performed in uncertain cases. Normal: 90% of food leaves the stomach within 60-90 minutes.
• Esophageal pH Monitoring: Rules out GERD as symptom cause. Normal: pH > 4 for less than 4% of the day.

Medications

• Proton Pump Inhibitors (PPIs): Omeprazole (20-40 mg daily) or esomeprazole (20-40 mg daily). Reduce gastric acid secretion, especially effective if acid-related. Duration: 4-8 weeks.
• H2-Receptor Blockers: Famotidine (20 mg twice daily). Weaker than PPIs but safe for mild cases.
• Prokinetic Agents: Domperidone (10 mg three times daily before meals) or metoclopramide (10 mg three times daily). Enhance gastric motility and emptying, particularly useful with confirmed delayed emptying.
• 5-HT4 Agonists: Prucalopride (1-2 mg daily) if available. Improve stomach and intestinal movement.
• Psychotropic Medications: SSRIs like sertraline (50 mg daily) when anxiety or depression coexist. Improve symptoms in 60-70% of patients.
• Alpha-2-Delta Inhibitors: Pregabalin (150 mg daily) may address visceral hypersensitivity.
• H. pylori Eradication Therapy: If positive: bismuth + PPI + two antibiotics (amoxicillin + clarithromycin) for 10-14 days. Success rate: 85-95%.

Procedures

• Upper Endoscopy (EGD): Confirms diagnosis, rules out organic lesions, and obtains samples for H. pylori testing.
• Botulinum Toxin Injection: Rarely used in severe treatment-resistant cases; limited evidence for efficacy.
• Gastric Electrical Stimulation: Experimental procedure for severe refractory cases; very rarely employed.

Lifestyle Modifications

• Dietary Adjustments: Eat small frequent meals (5-6 daily) instead of large ones. Avoid fatty, spicy, and heavily seasoned foods. Reduce caffeine, chocolate, and alcohol. Gradually increase fiber intake.
• Stress Management: Practice relaxation techniques: yoga, meditation, deep breathing. Cognitive Behavioral Therapy (CBT) is highly effective for symptom reduction.
• Regular Exercise: Brisk walking or swimming for 30 minutes daily improves digestion and mental health.
• Sleep Quality Improvement: Adequate sleep (7-8 hours) and left-side sleeping position may help.
• Avoid Smoking and Alcohol: Both negatively impact gastric motility.
• No Eating Before Bedtime: Avoid eating 2 hours before sleep to allow proper emptying.
• Adequate Hydration: 6-8 glasses of water daily aids digestion.

• Malnutrition: Persistent appetite loss and food avoidance lead to deficiency in protein, vitamins, and essential minerals (iron, calcium, B12). Symptoms include fatigue and generalized weakness.
• Anemia: Results from malnutrition and iron deficiency, especially in women. Hemoglobin may drop below 12 g/dL.
• Chronic Depression and Anxiety: Psychological impact of persistent symptoms may develop into major depressive disorder or generalized anxiety disorder, affecting work and social life.
• Reduced Quality of Life and Productivity: Recurrent symptoms cause work and school absences and decreased productivity.
• Sleep Disorders: Nocturnal symptoms may cause insomnia, worsening symptoms and psychological state.
• Development of Organic Diseases (Rare): In rare cases, associated complications may develop or organic diseases discovered years later.
• Medication Dependency: Excessive medication use without lifestyle changes leads to long-term side effects, particularly with prolonged PPI use (increased osteoporosis risk).

• Manage Psychological Stress and Anxiety: Practice daily relaxation techniques, seek therapy if needed, avoid stressors. Chronic stress is a major trigger.
• Maintain a Balanced Healthy Diet: Eat small frequent meals, avoid fatty, spicy, heavily seasoned foods. Increase vegetables, fruits, whole grains. Avoid overeating.
• Identify and Avoid Personal Triggers: Determine which foods/beverages worsen symptoms (caffeine, chocolate, alcohol, carbonated drinks) and eliminate them.
• Don't Smoke and Avoid Secondhand Smoke: Smoking weakens stomach lining protection and impairs motility.
• Limit Alcohol Consumption: Alcohol irritates the stomach and slows digestion.
• Exercise Regularly: Moderate physical activity (30 minutes daily) improves GI motility and mental health.
• Improve Sleep Quality: Consistent adequate sleep (7-8 hours) and fixed sleep times reduce stress.
• Early H. pylori Detection and Treatment: Prompt treatment if diagnosed may prevent symptom progression.
• Avoid Excessive NSAID Use: Use safer alternatives (acetaminophen) when needed.
• Maintain Healthy Weight: Excess weight increases abdominal pressure on the digestive system.