Femoral Hernias: Types, Symptoms, and Medical Emergencies
A hernia occurs when a viscus—an internal organ, typically from within the abdomen—protrudes through a point of weakness in the abdominal wall. These weaknesses can be inherent, as seen in umbilical, inguinal, and femoral hernias, or they can be acquired, such as an incisional hernia which develops at the site of a previous surgical incision through the muscles and fascia.
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Key Facts
- Femoral hernias occur due to weaknesses in the abdominal wall.
- A reducible hernia can be pushed back into the abdominal cavity.
- An irreducible hernia is stuck, often due to adhesions.
- Obstructed hernias involve twisted or constricted intestines.
- Strangulated hernias are life-threatening emergencies due to loss of blood supply.
- Necrosis (tissue death) and gangrene (tissue decay) can result from strangulation.
Classifying Femoral Hernias
Femoral hernias are categorized based on whether they can be returned to the abdomen and whether they are causing a blockage or restricting blood flow.
Reducible Femoral Hernias
A reducible femoral hernia is the most common type. It occurs when the protruding organ can be pushed back into the abdominal cavity, either spontaneously or through manual manipulation. These are typically painless.
Irreducible Femoral Hernias
An irreducible hernia cannot be completely pushed back into the abdomen. This is typically caused by adhesions (fibrous bands of tissue) between the hernia and the hernial sac. Unlike reducible types, these often cause pain and a general feeling of illness.
Obstructed Femoral Hernias
An obstructed hernia occurs when the part of the intestine involved becomes kinked, twisted, or constricted. This prevents the normal passage of intestinal contents, leading to an intestinal obstruction.
Strangulated Femoral Hernias
Strangulation is a critical medical emergency. It occurs when the constriction of the hernia is so severe that it limits or completely blocks the blood supply to the involved bowel. Because femoral and inguinal hernias occur through narrow weaknesses in the abdominal wall, they are more prone to strangulation.
Symptoms of strangulation include severe abdominal pain, nausea, and vomiting. If not treated with immediate surgery, the lack of blood flow leads to necrosis (tissue death) and subsequently gangrene (tissue decay), which is life-threatening.
The Term "Incarcerated"
The term incarcerated is used inconsistently across medical literature. Some physicians use it interchangeably with "irreducible," meaning the hernia is stuck in the canal. Others use it specifically to describe a hernia that is irreducible and obstructed but has not yet become strangulated (meaning there is no vascular compromise). Regardless of the specific definition used, an incarcerated hernia is always irreducible.
| Type | Reducible? | Primary Characteristic | Urgency |
|---|---|---|---|
| Reducible | Yes | Can be pushed back; usually painless | Routine Monitoring |
| Irreducible | No | Stuck due to adhesions; may cause pain | Medical Evaluation |
| Obstructed | No | Intestine is twisted or kinked | Urgent |
| Strangulated | No | Loss of blood supply to the bowel | Immediate Emergency |
Frequently Asked Questions
What is the difference between a reducible and irreducible hernia?
A reducible hernia can be pushed back into the abdominal cavity spontaneously or manually, while an irreducible hernia is stuck and cannot be returned to the cavity, often due to adhesions.
Why is a strangulated hernia considered a medical emergency?
It is an emergency because the blood supply to the bowel is obstructed. This can lead to necrosis (tissue death) and gangrene (tissue decay), which are life-threatening conditions requiring immediate surgery.
What are the symptoms of a strangulated hernia?
The characteristic symptoms include severe abdominal pain, nausea, and vomiting.
What does "incarcerated" mean in the context of a hernia?
While definitions vary, it generally refers to a hernia that is irreducible (stuck). Some use it to describe a hernia that is obstructed but not yet strangulated.
What causes an incisional hernia?
An incisional hernia is caused by a weakness created by a previous surgical incision through the muscles and fascia of the abdominal wall.