Peptic Ulcer Disease

Overview

Mucosal degeneration/necrosis from acid-peptic exposure. 98-99% duodenum or stomach (4:1 ratio). Acute or chronic — different pathogenesis.

Acute peptic (stress) ulcers

Multiple, small, mostly gastric.

Etiology: severe stress — psychological, or physiological (shock, trauma, sepsis, burns=CURLING’S ulcers/posterior 1st duodenum, intracranial lesions=CUSHING’S ulcers/vagal hyperacidity, drugs, local irritants).

Pathogenesis: unclear except Cushing’s (true acid HYPERSECRETION demonstrable). Others: normal/BELOW-normal acid — mechanism instead: ischaemic-hypoxic injury + mucus barrier depletion.

Morphology: Gross — multiple (>3 in 75%), mostly gastric, oval/circular, <1cm. Micro — shallow, NO muscular layer invasion, variable inflammation. Heal by re-epithelialisation, NO SCARRING. Complications: haemorrhage, perforation.

Chronic peptic ulcers (gastric + duodenal)

TWO DISTINCT DISEASES (etiology/pathogenesis/clinical) but SIMILAR morphology. Common in industrialised populations. Duodenal peak 5th decade, gastric 6th decade. Both more in males. Duodenal 4x more common than gastric. ~10% male population overall prevalence.

Etiology (multifactorial, 2 dominant)

1. H. pylori gastritis — 15-20% antral infection → duodenal ulcer. Gastric colonisation ALONE essentially NEVER causes gastric ulcer (asymptomatic) — key asymmetry
2. NSAIDs — direct toxicity, endothelial+epithelial damage, both sites
3. Acid-pepsin secretion — essential permissive factor. NEVER occurs in pernicious anaemia (no parietal/chief cells) — informative negative
4. Gastritis — always present around gastric ulcer (cause/effect unclear)
5. Local irritants — spiced food, alcohol, smoking, unbuffered aspirin — concentrate at antrum/lesser curvature (longest exposure sites)
6. Dietary — regional nutritional deficiency link (poor SES, South India) but not in West
7. Psychological — stress, anxiety, “ulcer personality”
8. Genetic — blood group O; duodenal has STRONGER genetic influence (familial, twins, HLA-B5)
9. Hormonal — gastrinoma/Zollinger-Ellison syndrome, parathyroid/adrenal/pituitary hyperfunction
10. Misc — alcoholic cirrhosis, CRF, hyperparathyroidism, COPD, chronic pancreatitis

Pathogenesis — genuinely different

Duodenal: ACID-PEPSIN HYPERSECRETION driven, esp. night fasting-stomach hypersecretion (vagal). H. pylori = dominant cause. Gastric: acid usually NORMAL-TO-LOW (hyperacidity if present = gastrin-driven). Dominant mechanism = MUCUS BARRIER BREAKDOWN. Associations: gastritis, bile reflux, drugs, alcohol, tobacco.

Comparison

Morphology (shared 4-layer structure)

Necrotic zone → superficial exudative layer → granulation tissue → cicatrisation (fibrous scar) — layering reflects chronic injury-healing cycle.

Complications

Both: haemorrhage, perforation, ±obstruction. KEY: duodenal NEVER malignant transformation; gastric <1% — gastric ulcer ALWAYS needs biopsy/follow-up, duodenal doesn’t.

Clinical relevance

Never vs <1% malignant transformation = highest-stakes fact — direct justification for mandatory gastric ulcer biopsy/follow-up, not needed for duodenal. Genuinely different pathogenesis (duodenal=acid-hypersecretion; gastric=barrier-breakdown, usually normal/low acid) = frequent confusion point since both grouped as “peptic ulcer disease” — mechanistically distinct diseases sharing only final histologic appearance. Absence of ulceration in pernicious anaemia = clean logical proof acid-pepsin is NECESSARY factor — remove acid/pepsin-producing cells entirely, ulcer risk eliminated regardless of other factors. Cushing’s + Curling’s ulcers = useful paired mnemonic for stress ulcer subtypes tied to specific contexts (intracranial/vagal hyperacidity vs burns) — more useful than treating “stress ulcer” as one entity.

Overview

Peptic ulcers are areas of mucosal degeneration/necrosis from exposure to acid-peptic secretions — can occur anywhere HCl/pepsin reach the mucosa, but 98–99% occur in the duodenum or stomach (ratio 4:1). Each site can be acute or chronic, with genuinely different pathogenesis.

Acute Peptic (Stress) Ulcers

Multiple, small mucosal erosions, mainly gastric, occasionally duodenal.

Etiology — follows severe stress: psychological stress, or physiological stress from shock, severe trauma, septicaemia, extensive burns (Curling’s ulcers, posterior first-part duodenum), intracranial lesions (Cushing’s ulcers, from hyperacidity via excessive vagal stimulation), drugs (aspirin, steroids, NSAIDs), local irritants (alcohol, smoking, coffee).

Pathogenesis: genuinely unclear mechanism except in Cushing’s ulcers, where true gastric acid hypersecretion is demonstrable (from intracranial trauma/surgery/tumour). In all other causes, acid secretion is normal or below normal — so the mechanism must be different: proposed ischaemic-hypoxic mucosal injury, and depletion of the protective gastric mucus barrier leaving the mucosa vulnerable even to normal acid-peptic levels.

Morphology: gross — multiple (>3 in 75% of cases), most often gastric (then duodenal first part), oval/circular, usually <1 cm. Micro — shallow, do not invade the muscular layer; variable inflammatory reaction at margins/base depending on duration. Typically heal by complete re-epithelialisation without scarring. Complications: haemorrhage, perforation.

Chronic Peptic Ulcers (Gastric and Duodenal Ulcers)

Gastric and duodenal ulcers are two genuinely distinct diseases in etiology, pathogenesis, and clinical features — but their morphology is similar and diagnostic. Common in industrialised populations. Duodenal ulcer peaks in the 5th decade, gastric a decade later (6th); both more common in males; duodenal ulcer is ~4× more common than gastric; overall gastroduodenal ulcer prevalence ~10% of the male population.

Etiology (Multifactorial — Two Dominant Factors)

1. Helicobacter pylori gastritis — ~15–20% of antral H. pylori infections develop duodenal ulcer; gastric colonisation alone essentially never causes gastric ulceration (asymptomatic) — worth noting this asymmetry explicitly.
2. NSAID-induced mucosal injury — direct toxicity, endothelial damage, epithelial injury to both gastric and duodenal mucosa.
3. Acid-pepsin secretion — essential permissive factor for both ulcer types — peptic ulcers never occur in pernicious anaemia, where parietal/chief cells (and thus acid/pepsin) are absent, a genuinely informative negative association.
4. Gastritis — always present around gastric ulcers (cause vs effect unclear); population distribution parallels chronic gastritis.
5. Local irritants — spiced food, alcohol, smoking, unbuffered aspirin — concentrate at the pyloric antrum and lesser curvature, the sites of longest local-irritant exposure and thus the commonest gastric ulcer locations.
6. Dietary factors — nutritional deficiency implicated regionally (poor socioeconomic strata, South Indian duodenal ulcer incidence), though not in Western populations.
7. Psychological factors — stress, anxiety, fatigue, “ulcer-type personality.”
8. Genetic factors — blood group O predisposes; duodenal ulcer shows stronger genetic influence (familial clustering, monozygotic twin concordance, HLA-B5 association).
9. Hormonal factors — gastrin-secreting islet cell tumour (Zollinger-Ellison syndrome); endocrine hyperfunction of parathyroid/adrenal cortex/anterior pituitary.
10. Miscellaneous associations — alcoholic cirrhosis, chronic renal failure, hyperparathyroidism, COPD, chronic pancreatitis.

Pathogenesis — Duodenal vs Gastric (Genuinely Different Mechanisms)

Duodenal ulcer: driven fundamentally by acid-pepsin hypersecretion — night-time fasting-stomach acid hypersecretion under vagal influence is a notable feature. H. pylori infection is the dominant cause.

Gastric ulcer: acid levels are usually normal-to-low; when hyperacidity is present, it is typically secondary to elevated serum gastrin. The dominant mechanism instead is breakdown of the protective mucus barrier, with associations to gastritis, bile reflux, drugs, alcohol, tobacco.

Duodenal vs Gastric Ulcer — Contrasted

Morphology (Shared Histologic Structure)

Chronic peptic ulcers, gastric or duodenal, share a characteristic four-layer histologic structure: necrotic zone (innermost, exposed surface), superficial exudative layer, granulation tissue, and cicatrisation (fibrous scar, deepest) — the layering itself reflects the chronic cycle of injury and attempted healing.

Complications

Both types: haemorrhage, perforation, occasionally obstruction. Critical distinguishing point: duodenal ulcers never undergo malignant transformation, while gastric ulcers do so in <1% — meaning a gastric ulcer, unlike a duodenal one, always warrants biopsy/follow-up to exclude malignancy.

Clinical Relevance

• The never-versus-<1% malignant transformation distinction between duodenal and gastric ulcers is one of the highest-stakes facts in this topic — it is the direct justification for why every gastric ulcer requires biopsy and endoscopic follow-up to confirm healing and exclude an underlying malignancy, while a duodenal ulcer does not carry that same imperative.
• The genuinely different pathogenesis behind duodenal ulcer (acid-hypersecretion-driven) versus gastric ulcer (barrier-breakdown-driven, usually with normal-to-low acid) is a frequent point of confusion, since both are grouped together as “peptic ulcer disease” — recognising that they are mechanistically distinct diseases sharing only a final common histologic appearance prevents treating them as interchangeable.
• The absence of peptic ulceration in pernicious anaemia is a clean logical proof that acid-pepsin secretion is a necessary factor in ulcer pathogenesis — a condition that eliminates the acid-producing and pepsin-producing cells entirely also eliminates ulcer risk, regardless of any other predisposing factor present.
• Cushing’s and Curling’s ulcers are a useful paired mnemonic for stress ulcer subtypes tied to specific clinical contexts (intracranial pathology and burns respectively) — recognising them by name and mechanism (vagally-driven hyperacidity for Cushing’s, versus the less acid-dependent mechanism for burns/Curling’s) is more useful than treating “stress ulcer” as one undifferentiated entity.

• Duodenal vs gastric ulcer: dominant pathogenesis (acid-hypersecretion vs barrier-breakdown) compared
• Four-layer histologic structure of a chronic peptic ulcer

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