Groin pain after running is common, accounting for about 10% of all running-related injuries. The most likely cause is strain or irritation of the adductor muscles along your inner thigh, but several other conditions can produce similar pain. Where exactly it hurts, when the pain started, and what makes it worse all point toward different causes.
Adductor Muscle Strain
The adductor muscles run along your inner thigh and pull your leg inward. They also stabilize your pelvis every time your foot hits the ground. Of the three main adductor muscles, the adductor longus is the one most commonly injured. During running, these muscles work hard during the stance phase of your stride, absorbing force and keeping your pelvis level. When they’re overloaded, whether from a sudden increase in mileage, hill running, or simply fatigue, the muscle fibers can develop small tears.
A mild adductor strain feels like tightness or a dull ache along the inner thigh that comes on during or after a run. A more severe strain produces sharp pain with each stride, sometimes making it painful to push off or change direction. You’ll typically feel tenderness when you press along the inner thigh, and squeezing your knees together against resistance will reproduce the pain.
Pubic Bone Inflammation
If your groin pain centers right at the front of your pelvis rather than along the inner thigh, the issue may be inflammation at the pubic symphysis, the joint where your two pubic bones meet. This condition, called osteitis pubis, develops from repetitive stress on the cartilage and ligaments holding that joint together. Runners who log high mileage are particularly susceptible because every stride loads this joint.
The key difference from a muscle strain is that the pain sits deeper, right at the bony midline of your pelvis, and often radiates into both inner thighs or into the lower abdomen. You might also notice pain when climbing stairs, rolling over in bed, or standing on one leg. Because the cartilage in the joint is inflamed, this condition tends to linger longer than a simple muscle strain and often requires a more significant period of reduced activity.
Hip Labral Tears
The hip joint has a ring of cartilage (the labrum) that deepens the socket and cushions the joint. Repetitive hip flexion during running can gradually wear or tear this cartilage, producing groin pain that feels like it’s coming from deep inside the hip rather than from the muscles. The hallmark signs are a clicking or popping sensation when you move your hip, and a feeling of instability or “catching” during certain movements. The pain often worsens with prolonged sitting, pivoting, or deep squatting, not just running.
If your groin pain comes with mechanical symptoms like clicking or locking, that pattern points toward the hip joint itself rather than the surrounding muscles.
Athletic Pubalgia (Sports Hernia)
Athletic pubalgia is a tear or weakness in the soft tissue of the lower abdominal wall, near where it attaches to the pubic bone. Unlike a true inguinal hernia, there’s no visible bulge in the groin. The pain typically develops gradually and worsens with sprinting, cutting, or any explosive movement. One distinguishing feature: coughing, sneezing, or bearing down often makes the pain sharper, because those actions increase pressure on the weakened tissue. If your groin pain flares when you sneeze or cough, this is worth investigating.
Why Female Runners Are at Higher Risk
Research shows hip and groin injuries make up about 11% of running injuries in women compared to 6.3% in men. Wider pelvic anatomy changes the angle at which forces travel through the hip and groin with each stride, placing more stress on the adductor muscles and the pubic symphysis. Women runners experiencing persistent groin pain shouldn’t dismiss it as a minor strain, particularly if it doesn’t improve within a couple of weeks of reduced activity.
Recovery Timelines
For mild to moderate adductor strains (the most common scenario), the typical timeline is encouraging. Athletes in one prospective study became pain-free in a median of 13 days and returned to full training in about 18 days. The key benchmarks before returning to running include pain-free stretching of the inner thigh, pain-free resistance exercises, and the ability to sprint at full effort without discomfort.
Severe strains, where the muscle is significantly torn, take much longer. In the same study, athletes with severe tears needed a median of 55 days to become pain-free and about 78 days to return to full training. That’s roughly two and a half months, and rushing back before meeting those pain-free benchmarks increases the risk of re-injury.
Conditions involving the joint or bone, like pubic symphysis inflammation or labral tears, generally follow longer and less predictable timelines because cartilage heals more slowly than muscle.
Strengthening to Prevent Recurrence
The single most effective exercise for preventing adductor injuries is the Copenhagen adductor bridge. You lie on your side with your top leg supported on a bench or a partner’s shoulder, then lift your body by squeezing your inner thigh. Research on athletes showed that performing about 470 total repetitions over eight weeks reduced injury risk and increased adductor strength by roughly 10%.
A practical way to build up: start with two sets of six repetitions per side, twice a week. Every two weeks, add two repetitions per set, progressing from 2×6 to 2×8, then 2×10, then 2×12. This gradual loading gives the muscles time to adapt without creating new soreness. You can find video demonstrations of this exercise by searching “Copenhagen adductor exercise.”
Beyond targeted strengthening, sudden jumps in weekly mileage are one of the most reliable triggers for groin strain. Keeping mileage increases to about 10% per week gives your adductors time to adapt to the new load.
Signs That Need Prompt Attention
Most groin pain after running is musculoskeletal and resolves with rest and strengthening. However, groin pain accompanied by unexplained weight loss, fever, fatigue, painful urination, or pain that wakes you at night can signal something unrelated to running, including infections, stress fractures, or other conditions that require medical evaluation. Groin pain that hasn’t improved at all after two to three weeks of rest also warrants a closer look, since persistent pain may indicate a labral tear, pubic bone inflammation, or athletic pubalgia rather than a simple muscle strain.