Small Bowel Injury

Overview

The small intestine, or small bowel, is the long, coiled tube where most digestion and nutrient absorption take place. A small bowel injury is damage to this organ, which may be a bruise, a tear in the wall, injury to its blood supply, or a full hole (perforation). Because the small bowel carries digestive fluids and bacteria, a perforation can leak these contents and cause serious infection.

Small bowel injuries often result from blunt trauma, such as a seatbelt force in a car crash, or from penetrating wounds. They can be challenging to detect, because early imaging may look normal even when injury is present, so people are often watched closely after significant abdominal trauma.

Symptoms

Symptoms may develop gradually over hours and include:

• Abdominal pain and tenderness that worsens over time
• A firm, distended, or guarded abdomen
• Nausea and vomiting
• Fever and chills
• Bruising across the abdomen, such as a seatbelt mark
• A racing heartbeat, dizziness, or fainting with significant blood loss or infection

Worsening abdominal pain after trauma, especially with fever or a rigid belly, is an emergency. Because symptoms can be delayed, any concerning abdominal trauma deserves careful evaluation.

Causes

Small bowel injuries arise from force or objects affecting the abdomen. Common causes include:

• Blunt trauma: Seatbelt or steering wheel force in crashes, falls, or direct blows can crush or tear the bowel.
• Penetrating trauma: Stab and gunshot wounds.
• Surgical or procedural injury: The small bowel can be injured during abdominal operations, especially with scarring from previous surgery.
• Strangulated hernia or obstruction: Loss of blood supply can damage a segment of bowel.

Because abdominal trauma can affect several organs, small bowel injuries often occur with other internal injuries.

Risk Factors

• High-energy crashes, especially with a lap belt across the abdomen
• Penetrating abdominal trauma
• Previous abdominal surgery with scar tissue (adhesions)
• Bowel obstruction or a strangulated hernia
• Procedures involving the abdomen

Diagnosis

Small bowel injuries can be hard to diagnose, so doctors combine several approaches:

• Physical exam: Repeated checks for tenderness, rigidity, and changes over time.
• CT scan: Looks for free air, fluid, bowel wall changes, and other injuries, though early scans may miss subtle injuries.
• Blood tests: To assess blood loss and signs of infection.
• Observation: Monitoring over hours to detect a developing injury.
• Surgical exploration: Used when injury is strongly suspected but unclear.

Because findings can evolve, people with significant abdominal trauma are often reassessed several times.

Treatment

Treatment depends on the type and severity of the injury.

• Observation: Some minor bruising without a tear may be watched closely without surgery.
• Surgical repair: Tears are stitched closed, and a badly damaged segment may be removed with the healthy ends reconnected.
• Antibiotics: Given when there is a perforation or contamination.
• Supportive care: Fluids, blood if needed, and rest for the bowel, sometimes with a tube to keep the stomach empty.

With timely treatment, many people recover well, although recovery time depends on the severity of the injury and any complications.

Prevention

• Wear seatbelts correctly, with the lap belt low across the hips
• Use protective equipment in sports and at work
• Treat hernias and bowel obstructions before they cut off blood supply
• Seek prompt care for worsening abdominal pain after trauma

When to See a Doctor

Seek emergency care after abdominal trauma if you have:

• Worsening abdominal pain or tenderness
• A firm, swollen, or rigid belly
• Fever, chills, or persistent vomiting
• Dizziness, pale skin, or fainting

Because small bowel injuries can be slow to show up, do not assume a normal first scan rules out injury. Return promptly if abdominal symptoms develop or worsen in the hours and days after significant trauma or abdominal surgery.

Related Topics

Frequently Asked Questions

References

1. American College of Surgeons. Abdominal Trauma.
2. Mayo Clinic. Abdominal injuries.
3. MedlinePlus, U.S. National Library of Medicine. Bowel perforation.
4. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Digestive system injuries.