Where it hurts is a clue, not a diagnosisStrong evidence
The groin is where the inner thigh muscles, the hip flexors, the lower tummy wall, the pubic bone and the hip joint all meet, and the testicles, kidneys and pelvic organs can be felt there too. An international agreement on athletes' groin pain, made in Doha, sorts the common sports causes by the spot and the tests that bring the pain on, keeps the hip joint in mind every time, and lists the other conditions not to miss.
So this guide says a spot points to a cause rather than proving it, and an examination decides. NHS inform says hip problems can be felt in the buttock, groin, back, thigh or knee, and new problems should begin to settle within 6 weeks.
Sources 1, 2, 3, 4
In active people: the muscles and tendonsEmerging evidence
The Doha agreement names four muscle and tendon causes. Adductor-related pain is tender on the inner thigh tendon and hurts when you squeeze the knees together against resistance; iliopsoas-related pain is tender deep at the front of the hip and hurts lifting the knee; inguinal-related pain is tender over the groin canal just above the crease, with no hernia you can feel, and is worse with coughing, sneezing or a resisted sit-up; and pubic-related pain is tender on the pubic bone itself.
Adductor-related pain was the main finding in 58% of 207 athletes in one clinic and 61% of 100 in another, and a third to almost half had more than one cause. Half of 695 sub-elite footballers had hip or groin pain during a season. A 2025 family-medicine review estimates that 2% to 20% of athletes get groin pain, depending on the sport and the level, and says how often it happens in everyone else is unknown. Nearly all of this research is in men.
Sources 1, 5, 6, 7, 3
The hip jointEmerging evidence
A deep groin pain, a pinch with deep bending, sitting low or getting out of a car, or clicking and catching can come from the hip joint itself: impingement or a labral tear in younger active adults, and arthritis from mid-life, a family-medicine review says. In 51 people whose hip joint was confirmed as the source by an injection, 55% felt it in the groin. In 120 people on surgical waiting lists, groin pain picked out hip arthritis rather than a narrowed spine in 84% of those with arthritis.
NICE (the National Institute for Health and Care Excellence) diagnoses osteoarthritis without a scan from 45 if the pain comes with activity and any morning stiffness lasts 30 minutes or less.
Sources 2, 8, 9, 10
A lump: a hernia, or swollen glandsStrong evidence
An inguinal hernia is a lump where the leg joins the tummy that may get bigger when you cough, sneeze or strain and smaller when you lie down, sometimes with a heavy, dragging feeling; the NHS says pain in or around a smaller hernia can be a sign it is being squeezed (strangulated). A femoral hernia is a small lump at the top of the thigh, in the groin, about the size of a grape, mainly in women over 50, and it needs treatment in hospital because it can become strangulated. Most hernias are diagnosed by examination, and an ultrasound is rarely needed, the international guideline says.
Men with a painless or barely painful inguinal hernia can usually wait safely: in a trial of 720 men, a hernia became trapped at a rate of 1.8 per 1,000 men for each year of follow-up, though 23% of those who waited went on to have surgery, mostly for more pain. Tender lumps that come with an infection are usually swollen glands, which go down within 1 to 2 weeks.
Sources 11, 12, 13, 14, 15
The testicles, the kidneys and the pelvisStrong evidence
Sudden, severe testicle pain can be a twisted testicle (testicular torsion), which can lose the testicle if it isn't treated quickly, the NHS says: in 81 teenagers, the chance of saving it fell the longer the symptoms had lasted. Other causes are an infection, an injury, a hernia, a cyst and swollen veins; pain alone isn't usually a sign of testicular cancer.
Kidney stone pain usually starts in the side of the tummy or the lower back and may spread to the groin, the testicles or the area around the opening of the vagina, and it may come and go. In women, pelvic pain can come from period pain, an ovarian cyst, endometriosis and, rarely, an ectopic pregnancy, which can cause pain low down on one side with a missed period, bleeding and pain in the tip of the shoulder. Two of those NHS pages are past their review dates, so this guide checks their wording against the NHS pelvic pain page.
Sources 16, 17, 18, 19, 20, 21, 22
PregnancyEmerging evidence
Pelvic girdle pain in pregnancy is felt over the pubic bone at the front, across the lower back, between the vagina and anus, and spreading to the thighs, and it is worse walking, on stairs, standing on one leg, turning over in bed and moving your legs apart, the NHS says (a page past its review date). Groin swellings in pregnancy are most often harmless swollen veins, the international hernia guideline says, and can be watched.
Sources 23, 13
Nerves and the backEmerging evidence
Rarely, a trapped obturator nerve causes inner thigh pain that comes on with exercise, starts near the adductor tendon and spreads down the inside of the thigh: one series described 32 athletes. Burning, tingling or numbness from the lower tummy to the inner thigh, often after a hernia repair, can come from the genitofemoral nerve, and the NHS lists pain or numbness lasting more than 3 months after a repair as a possible complication. Both rest on small series and reviews.
The back can send pain to the groin with or without back pain, NHS inform says, and 14% of 50 people with pain from the sacroiliac joint at the back of the pelvis felt it in the groin.
Sources 24, 25, 26, 4, 27, 1
Children and teenagers: the hip comes firstStrong evidence
The NHS asks for an urgent GP appointment or NHS 111 if a child gets sudden pain in the hip, thigh or knee, because hip problems can be felt there, or is limping or can't put weight on one leg. Irritable hip is the commonest cause and usually settles in 1 or 2 weeks; less common but more serious causes include an infected hip, a broken bone and Perthes disease. A slipped growth plate at the top of the thighbone and a piece of growth plate pulled off the pelvis (an avulsion fracture) are on the Doha agreement's list not to miss.
Sources 28, 1
A runner's groin pain that builds: the hip boneEmerging evidence
Stress fractures of the neck of the thighbone make up about 3% of sports stress fractures, most often in marathon and distance runners, and exercise-related groin pain is the commonest symptom, a review says. Delay in diagnosis is common and makes it more likely the bone will shift, which is why the warning signs ask a runner with groin pain that builds with every step or hurts at night to stop and get checked the same day.
Source 29
When a scan or test helpsStrong evidence
Most groin pain is sorted out from the story and an examination; tests for the hip joint are better at ruling it out than in. A hernia usually needs no scan. In pain just above the groin crease with no lump, an ultrasound that watches you strain rules out a true hernia, and a pelvic MRI (magnetic resonance imaging) helps when adductor or pubic pain is unclear or isn't improving. In sudden adductor injuries, the MRI grade didn't change the return time for most.
For the hip, standing X-rays come first, with MRI for a suspected labral tear, stress fracture or loss of blood supply to the bone, and NICE diagnoses osteoarthritis without imaging when the pattern fits. A suspected kidney stone in an adult gets a low-dose computed tomography (CT) scan within 24 hours (an ultrasound in pregnancy). A child may need an X-ray, and sometimes blood tests or other scans.
Sources 1, 13, 3, 30, 10, 2, 19, 28
How it usually goesEmerging evidence
In 81 male athletes with a sudden adductor injury on a criteria-based plan, most were pain-free in about 2 weeks and back in full team training in a median of 18 days; complete tears took about 2 to 3 months. Long-standing adductor pain needed an 8 to 12 week active programme in a trial. Many athletes with pain just above the groin crease improve with 4 to 6 weeks of physiotherapy, and hip-related pain is given at least 3 months of exercise.
Irritable hip usually settles in 1 to 2 weeks. After a hernia repair, recovery usually takes up to 4 to 6 weeks, and 10% to 12% have lasting pain that eases over time. No one can promise a date.
Sources 30, 31, 32, 33, 28, 14, 26, 13