Groin pain most commonly comes from a muscle strain, but the area is a crossroads of muscles, joints, nerves, and organs, so the list of possible causes is longer than you might expect. Where exactly the pain sits, how it started, and what makes it worse are the biggest clues to what’s going on. Here’s a breakdown of the most likely reasons and what each one feels like.
Muscle Strains: The Most Common Cause
The inner thigh muscles that pull your leg inward (the adductor group) are the usual suspects. A groin strain happens when one of these muscles is stretched or torn, typically during a sudden change of direction, a kick, or a sprint. You don’t have to be an athlete for this to happen. Slipping on ice, stepping off a curb awkwardly, or even getting out of a car at a bad angle can do it.
Groin strains are graded by severity. A mild strain (grade 1) causes tightness and minor pain but you can still walk and move. A moderate strain (grade 2) involves partial tearing, noticeable weakness, and pain that limits activity. A severe strain (grade 3) means a complete or near-complete tear, significant swelling, and difficulty bearing weight. Mild and moderate strains generally heal within one to two months. Severe strains, or strains in the same spot that keep recurring, can take several months.
Recovery follows a predictable exercise progression. Early rehab focuses on slow, controlled movements, gradually building to faster, more explosive work. Physical therapists typically use a set of benchmarks before clearing you for full activity: pain-free stretching, pain-free resistance exercises, and pain-free agility drills at full effort. Skipping these steps is how a one-time strain becomes a chronic problem.
Hernias
A hernia occurs when tissue pushes through a weak spot in the abdominal wall. Two types show up in the groin area. Inguinal hernias account for roughly 80% of all abdominal wall hernias and are about seven times more common in men. They often produce a visible bulge that tends to flatten out when you lie down. Serious complications like tissue getting trapped (incarceration) are relatively rare with inguinal hernias.
Femoral hernias are less common but more dangerous. They sit slightly lower in the groin and are almost twice as common in women. About 40% of femoral hernias present as a medical emergency, with the tissue already trapped or its blood supply cut off. The femoral canal is narrow, so herniated tissue gets stuck easily and can compress nearby blood vessels. If you feel a firm, painful lump in your lower groin that doesn’t go away when you lie down, that warrants prompt medical evaluation.
Hip Joint Problems
Pain from the hip joint itself often shows up as groin pain because the joint sits deep in the front of the pelvis. A hip labral tear, where the ring of cartilage lining the hip socket gets damaged, is one of the more common hip-related causes. The telltale signs are a clicking or popping sensation when you move, a feeling of instability, and pain that feels deep, almost like bone pain rather than the surface-level ache of a pulled muscle.
Labral tears can result from repetitive motions (common in dancers, hockey players, and runners), structural differences in hip shape, or general wear over time. One physical exam maneuver, called the FABER test, involves bending the hip, rotating the leg outward, and pressing down on the knee. It’s highly specific for labral tears, meaning a positive result strongly suggests the diagnosis. Imaging with MRI confirms it.
Early hip arthritis can also refer pain to the groin. If your groin aches after long walks, stiffens up in the morning, and has gradually worsened over months, the hip joint itself may be the source.
Nerve-Related Pain
The obturator nerve runs from the lower spine through the pelvis and into the inner thigh. When it’s compressed or irritated, it can cause burning or aching pain along the inner thigh and groin, along with weakness when you try to squeeze your legs together. The nerve supplies feeling to the skin on your upper inner thigh and controls most of the inner thigh muscles.
Obturator nerve compression can happen from pelvic surgery, pregnancy, a pelvic fracture, or sometimes a growth pressing on the nerve. The pain pattern is distinct: it’s more of a shooting or burning quality rather than the dull ache of a strain, and squeezing a pillow between your knees may feel noticeably weak on the affected side.
Testicular Causes in Men
Pain that starts in the testicle frequently radiates up into the groin. Two conditions stand out because they require very different responses.
Epididymitis is an infection or inflammation of the tube behind the testicle. It typically causes gradual, worsening pain on one side, along with swelling and tenderness. The area may feel warm. It’s treatable with medication, and the pain builds over days rather than minutes.
Testicular torsion is the opposite pattern. The testicle twists on its cord, cutting off blood flow. Pain is sudden, severe, and often accompanied by nausea or vomiting. This is a surgical emergency, most common in adolescents and young men. The testicle can be saved if treated within a few hours, but viability drops fast after that. Sudden, intense testicular pain that comes on without an obvious injury should be treated as torsion until proven otherwise.
Gynecologic Causes in Women
Ovarian cysts are fluid-filled sacs on the ovaries. Most are small, cause no symptoms, and resolve on their own. Larger cysts can produce a dull ache or sharp pain on one side of the lower abdomen and groin, along with bloating and a feeling of pressure or heaviness. The pain may come and go.
A cyst becomes an emergency if it ruptures (causing sudden, severe pain and possible internal bleeding) or if it causes the ovary to twist, known as ovarian torsion. Torsion brings on abrupt, intense pelvic and groin pain with nausea and vomiting.
Pelvic inflammatory disease, an infection of the reproductive organs, can also cause groin and lower abdominal pain. It’s usually accompanied by fever, unusual discharge, or pain during urination. Severe pelvic infections can even lead to ovarian cysts themselves, creating overlapping symptoms.
When Groin Pain Is an Emergency
Most groin pain is a strain that heals on its own. But certain combinations of symptoms point to something that needs immediate attention:
- Groin pain combined with back, abdominal, or chest pain
- Sudden, severe testicular pain
- Testicular pain and swelling with nausea, vomiting, fever, chills, or blood in urine
- A firm groin lump that doesn’t flatten when you lie down, especially with nausea
- Sudden, severe pelvic pain with cold or clammy skin, rapid breathing, or lightheadedness
Narrowing Down Your Cause
A few questions can help you sort through the possibilities. Did the pain start during physical activity, especially a sudden movement? That points to a muscle strain. Is there a visible or palpable bulge? Think hernia. Does the pain feel deep and come with clicking or catching in the hip? A labral tear or hip joint issue is more likely. Is the pain burning or shooting, running down the inner thigh? Nerve involvement is worth investigating.
For pain that’s mild, came on during exercise, and improves with rest over a few days, you’re likely dealing with a strain. For pain that’s worsening, came on suddenly without clear cause, involves swelling or systemic symptoms like fever, or doesn’t improve after two weeks of rest, getting it evaluated helps rule out the causes that don’t resolve on their own.