Gastric Ulcers in Pigs: Causes, Signs, Treatment, and What To Do

By Dr Duncan Houston

Most pigs with gastric ulcers don’t look seriously sick… until they suddenly are.

That’s what makes this condition dangerous.

In practice, many pigs show subtle early signs like reduced appetite or slower growth, and it’s easy to assume it’s just feed variation or stress. Then suddenly, you’re dealing with pale animals, black stools, or even unexpected deaths.

This is a common and frustrating issue in pig production because the early signs are easy to miss, but the consequences can be severe.

This article will help you understand what’s actually happening, how worried you should be, and exactly what to do next.

Quick Answer

Gastric ulcers in pigs are caused by damage to the stomach lining, most commonly from finely ground feed, stress, sudden diet changes, or nutritional imbalances. Early signs include reduced appetite and slower growth, while severe cases can lead to bleeding, black stools, weakness, or sudden death. Mild cases can recover with treatment, but advanced ulcers can become life-threatening quickly and require urgent veterinary care.

Decision Snapshot

• Eating normally, no changes → low concern

• Eating less, slower growth → monitor closely

• Off feed, pale, lethargic → veterinary assessment needed

• Black stool, weakness, collapse → emergency

What Causes Gastric Ulcers in Pigs?

Gastric ulcers are not usually caused by one single factor.

In practice, they develop when feeding, stress, and management pressures combine.

The main drivers:

Feed particle size
Finely ground feed is the biggest contributor. It increases acid exposure in the upper stomach, where ulcers most commonly form.

Diet changes
Sudden feed changes disrupt normal stomach function and increase irritation.

Nutritional imbalance
Low vitamin E or selenium weakens the stomach’s natural protective barrier.

Stress and reduced feed intake
Pigs that go off feed, even briefly, lose protective buffering in the stomach.

High whey or highly fermentable diets
These can alter stomach dynamics and acidity.

Toxins or mineral excess
Copper imbalance or irritants can damage the stomach lining.

Infectious contributors
Helicobacter-like organisms may play a role in some cases.

What actually matters most

It’s not just the presence of one factor.
It’s how many risk factors are present at the same time.

That’s why ulcers often appear after:

• feed changes

• transport

• regrouping

• environmental stress

How to Recognise Gastric Ulcers

The biggest mistake is waiting for obvious signs.

Early signs (often missed)

• Slight drop in feed intake

• Slower weight gain

• Subtle behavioural changes

Progressive signs

• Pale gums from ongoing blood loss

• Weight loss

• Dehydration

Severe signs

• Black, tarry feces (melena)

• Weakness or collapse

• Abdominal discomfort or hunched posture

What vets actually worry about

In practice, the key concern is not just reduced appetite.

It’s:

• how quickly intake drops

• whether multiple pigs are affected

• whether there are signs of blood loss

A pig that is slightly off feed is very different from one that is off feed and pale.

Severity Framework

Low Risk

• Eating slightly less

• Still active and alert
  → Monitor and review feed quality

Moderate Risk

• Off feed for less than 48 hours

• Mild lethargy
  → Veterinary advice recommended

High Risk

• Off feed more than 48 hours

• Pale mucous membranes

• Ongoing weight loss
  → Requires veterinary treatment

Critical

• Black stool

• Collapse or weakness

• Signs of shock
  → Emergency

Mild vs Dangerous Ulcers (What People Get Wrong)

Mild ulcers often:

• reduce growth quietly

• go unnoticed for weeks

Severe ulcers:

• can bleed suddenly

• may cause rapid deterioration or death

The problem is that pigs can move from mild to severe without obvious warning signs.

How This Condition Typically Progresses

• Early stage → reduced intake, subtle changes

• 12 to 48 hours → worsening appetite and energy

• Several days → anemia and weight loss

• Advanced cases → bleeding, collapse, or perforation

In practice, some pigs look stable until they suddenly decline. That’s why early intervention matters.

How Vets Diagnose Gastric Ulcers

Diagnosis is based on combining clinical signs with testing.

Common methods:

• Physical exam including gum colour and hydration

• Blood tests to assess anemia and systemic effects

• Fecal testing for hidden blood

• Gastroscopy in high-value animals

• Imaging if perforation is suspected

Treatment of Gastric Ulcers in Pigs

Treatment must address both the ulcer and the underlying cause.

Core treatment approach:

Stabilisation

• Fluids to correct dehydration and support circulation

Acid suppression

• Proton pump inhibitors such as omeprazole

Mucosal protection

• Sucralfate to protect damaged areas

Antibiotics

• Used when infection is suspected

Feed correction

• Shift to less irritating, more digestible feed

• Reduce fines and improve fiber balance

Stress reduction

• Improve environment and reduce competition

The key principle

Treating the ulcer alone is not enough.
If feeding and management are not corrected, ulcers will return.

Prognosis: Will the Pig Recover?

• Mild ulcers → usually recover within 1 to 2 weeks

• Moderate cases → good outcome with treatment

• Severe or perforated ulcers → poor prognosis

Recurrence is common if underlying causes remain.

When Is This an Emergency?

Seek immediate veterinary care if you see:

• Black, tarry feces

• Collapse or weakness

• Pale or white gums

• Severe abdominal pain

• Multiple pigs deteriorating at once

These are signs of significant internal bleeding or advanced disease.

What To Do Right Now

If you suspect gastric ulcers:

1. Check feed intake across the group

2. Review any recent feed or management changes

3. Assess gum colour and behaviour

4. Isolate affected pigs if needed

5. Contact a veterinarian if signs persist beyond 24 to 48 hours

Do not:

• Ignore reduced appetite

• Continue problematic feed unchanged

• Delay action once severe signs appear

The rule to remember

If a pig stops eating and there is no clear reason,
ulcers should always be on your list until proven otherwise.

Common Mistakes

• Assuming reduced appetite is minor

• Using overly fine feed without monitoring

• Changing diets too quickly

• Missing early signs of anemia

• Treating individual pigs but ignoring herd-level issues

Prevention: What Actually Works

Feed management

• Maintain consistent diets

• Avoid excessive fine grinding

Gradual transitions

• Introduce new feed over 5 to 7 days

Nutritional balance

• Ensure adequate vitamin E and selenium

Stress reduction

• Minimise overcrowding and environmental disruption

Monitoring

• Daily feed intake tracking is one of the most effective tools

Routine and environment

• Stable routines and adequate space reduce physiological stress

Herd-Level Control

Ulcers are rarely just an individual issue.

Focus on:

• Feed audits

• Group intake monitoring

• Environmental consistency

• Early intervention systems

Strong systems prevent outbreaks.

FAQs

Can pigs recover from gastric ulcers on their own?

Mild cases may improve, but most require management changes and often treatment to prevent progression.

How quickly can ulcers become serious?

They can worsen over several days, but severe bleeding can occur suddenly in advanced cases.

What is the most common cause of ulcers in pigs?

Finely ground feed combined with stress is the most common cause in practice.

Should I treat the whole group or just one pig?

Both. Treat affected pigs and address herd-level risk factors to prevent recurrence.

Can ulcers come back?

Yes. Recurrence is common if feeding and management issues are not corrected.

Final Thoughts

Gastric ulcers in pigs are common, often preventable, and sometimes fatal.

The challenge is that early signs are subtle, while severe cases escalate quickly.

If you focus on feed quality, consistency, and early changes in appetite, you can prevent most serious cases. If signs progress, early veterinary involvement makes a significant difference.

If you are unsure whether your pigs’ signs are mild or serious, or you want help identifying risk factors in your feeding and management system, ASK A VET™ can help guide you through the next steps with practical veterinary advice tailored to your situation.