Groin Lump in Men — Hernia or Something Else?
A lump that appears when you stand and disappears when you lie down behaves very differently from one that does not. Here is how to read it, and when a lump becomes an emergency.
Most groin lumps in men are inguinal hernias — a weakness in the abdominal wall letting tissue push through. They typically appear on standing, coughing or lifting, and settle back when you lie down. They are common, and in themselves usually not dangerous.
What matters is the exception, and it is worth knowing before you need it.
A hernia that will not go back in is an emergency
If a groin lump becomes hard, painful and cannot be pushed back — particularly with vomiting, a swollen abdomen, or the skin over it turning red or dusky — the blood supply to the trapped tissue may be cut off. Go to A&E or call 999. This needs surgery within hours, not a scan appointment.
What the lump is likely to be
| What you notice | Commonly |
|---|---|
| Appears on standing, coughing or lifting; disappears lying down; a dragging ache | Inguinal hernia |
| Lower down, nearer the top of the thigh; more common in women but occurs in men | Femoral hernia — higher risk of becoming trapped |
| Firm, rubbery, does not change with position; sometimes several together | Lymph nodes — often reactive to infection in the leg, foot or genitals |
| Soft, mobile, painless, slow-growing over years | Lipoma |
| Attached to the skin, sometimes with a central punctum | Sebaceous or epidermoid cyst |
| Swelling in the scrotum rather than the groin crease | Testicular or scrotal — see our testicular lump guide |
Groin pain without a lump is a different question again — often a muscle or tendon problem, or referred from the hip. A hernia can also cause aching before any lump is visible, which is one reason imaging is useful when examination is inconclusive.
Why ultrasound suits this question
Ultrasound has one advantage here that no static scan can match: it works in real time. We can scan while you stand up, and while you cough or strain — which is exactly when a hernia appears. A hernia that hides on the couch shows itself on standing, and that dynamic assessment is often what settles an uncertain examination.
The scan shows whether a defect is present, how large it is, what has come through, and whether the contents move back and forth as you strain. It also identifies the alternatives — lymph nodes, a lipoma, a cyst — and distinguishes an inguinal from a femoral hernia, which matters because femoral hernias are more likely to become trapped and are treated with more urgency.
What we do not do is repair them. We provide diagnostic imaging only — no surgery. Whether a hernia needs repairing, and when, is a surgical decision made with your GP and a surgeon, weighing your symptoms against the risks of an operation. Many small, easily reducible hernias are simply watched.
How the appointment runs
- 1
BookingNo referral, no preparation, 30 minutes. Tell us when the lump appears and whether it goes back in.
- 2
The scanLying down first, then standing, with gentle straining or coughing so any hernia is seen when it actually appears. A chaperone is available on request.
- 3
What we assessThe defect and its size, what has passed through it, whether it reduces, the type of hernia, and the alternatives — nodes, lipoma, cyst — plus the other side, since hernias are often bilateral.
- 4
ResultsExplained on screen as we scan, with the written report usually with you within two hours — written so a GP or general surgeon can plan from it directly.
Your questions answered
Do all hernias need surgery?
Why do you scan me standing up?
Can a hernia cause pain without a visible lump?
What is the difference between inguinal and femoral?
Is it safe to keep exercising?
Do you repair hernias?
Scanned standing, when it actually shows
Dynamic assessment lying and standing with straining, both sides checked, and the alternatives ruled in or out — explained on screen as we scan, with the report usually within two hours for your GP or surgeon.
Kensington, London W8 4ED
3 mins from Notting Hill Gate
This article is general information about groin lumps, not individual medical advice. A hernia that becomes hard, painful and cannot be pushed back needs A&E or 999 immediately — see NHS guidance on hernia and inguinal hernia repair. We provide diagnostic imaging only; we do not perform hernia repair or any surgery.
Written and clinically reviewed by the HCPC-registered sonographers who perform this scan at IUS London — a CQC-registered diagnostic ultrasound clinic (Provider ID 1-2775844974). Your own findings are explained to you at the scan and set out in your report.
Author: Yianni Kiromitis, Senior Sonographer, HCPC RA38415 — over 20 years’ experience in NHS and private ultrasound
Medically reviewed: 10 August 2026
