Most of what patients read about groin hernias describes the inguinal hernia — the common type, predominantly affecting men, where careful watchful waiting can sometimes be justified. The femoral hernia is its dangerous cousin, and lumping the two together leads to genuinely harmful delays in treatment. If you — or your GP — suspect a femoral hernia, the conversation is different from the outset.
What makes a femoral hernia different
A femoral hernia passes through the femoral canal — a narrow, rigid-walled channel beneath the inguinal ligament, alongside the femoral vein at the very top of the thigh. Three features define its behaviour:
- The canal is narrow and unyielding — bounded by ligament and bone, it cannot stretch to relieve pressure on trapped tissue
- The lump sits lower than expected — in the crease of the groin or upper thigh rather than above it, and is often small and easy to dismiss as a swollen gland or fatty lump
- It is the one common hernia that is more frequent in women, particularly older women and those who have lost weight, where loss of supporting fat opens the canal
The risk in plain numbers
Femoral hernias account for a small minority of groin hernias but a disproportionate share of hernia emergencies. A substantial proportion — studies suggest of the order of 30–40% within two years — present acutely with incarceration or strangulation if left unrepaired. That is why surgical guidance worldwide is unambiguous: femoral hernias should be repaired promptly, regardless of symptoms. Watchful waiting, defensible for some inguinal hernias, has no place here.
Why they get missed
A femoral hernia is often a marble-sized lump in the groin crease of a woman in her 60s or 70s — easily attributed to a lymph node, a cyst, or nothing at all. Some are only discovered when they strangulate, presenting as bowel obstruction with vomiting and a tender thigh lump the patient hadn't connected to her abdomen. Any new, persistent lump at the top of the thigh deserves specialist assessment; where the diagnosis is uncertain, an ultrasound scan settles it quickly.
How femoral hernias are repaired
The keyhole approach is particularly elegant for femoral hernias: the same laparoscopic repair used for inguinal hernias places mesh behind the abdominal wall covering the femoral canal, the inguinal canal and the obturator canal simultaneously — closing not just the hernia you have, but the neighbouring weak points too. It is a day-case operation with a recovery similar to inguinal repair, and it avoids an incision in the groin crease. Open repair under local anaesthetic remains available for patients unfit for general anaesthesia.
The message worth repeating
If you have been told you have a femoral hernia — or you have an unexplained lump at the very top of your thigh — do not file it under "keep an eye on it". The planned operation is small; the emergency it prevents is not. The warning signs of strangulation are worth knowing in the meantime, but the better plan is repair before they ever appear.
Frequently asked questions
Why are femoral hernias more dangerous than inguinal hernias?
Because the femoral canal is narrow and rigid-walled, trapped tissue is gripped tightly and loses its blood supply easily. A large proportion of unrepaired femoral hernias present as emergencies with incarceration or strangulation.
Why do women get femoral hernias?
The female pelvis is wider, making the femoral canal proportionally larger, and loss of supporting fat with age or weight loss opens it further. Femoral hernia is the one common hernia that is more frequent in women.
What does a femoral hernia look like?
Typically a small, firm lump in the crease of the groin or at the very top of the inner thigh — lower than an inguinal hernia. It is often mistaken for a swollen lymph node or fatty lump, which is why specialist assessment matters.
Should a femoral hernia be repaired if it doesn't hurt?
Yes. Because of the high strangulation risk, surgical guidance recommends prompt repair of femoral hernias regardless of symptoms. Watchful waiting is not considered safe for this type of hernia.
How is a femoral hernia repaired?
Usually by keyhole surgery as a day case, placing mesh behind the abdominal wall to cover the femoral canal and neighbouring weak points in one repair. Open repair under local anaesthetic is an option for patients unfit for general anaesthesia.