Groin pain that isn't a hernia: the adductor, pectineus and iliopsoas trigger points behind it

Groin pain in people who train — runners, football players, weightlifters — is usually first explained as a strain, a sports hernia, or a hip problem. All of those exist, and they matter. But a substantial share of groin complaints behave like muscle rather than tissue: the pain is sharp with one specific movement, eases within minutes of stopping, reproduces when you press on a specific spot rather than a whole area, and changes day to day with training load. That behaviour is the signature of referred myofascial pain, and the muscles that produce it around the groin are among the most commonly involved in the whole body: the adductors, the pectineus, the iliopsoas and the lower portion of the abdominal wall (travell1942, simons2004).

There is a second, quieter population with the same problem: people who never train. Sitting for long hours keeps the iliopsoas in a shortened position, and the adductors alternate between shortening and guarding; in these patients the groin pain arrives without any injury to explain it, is worse after long sits, and is often mistaken for a hip or gynecological problem — sometimes for years.

For the terminology and interpretation used here, compare What are trigger points?; Primary vs secondary trigger points; How to read referred pain maps. These guides distinguish the definition of a trigger point, its classification and the limits of a referred-pain map.

The adductor longus and brevis sit at the front of the inner thigh and are the most common source of groin myofascial pain. Their trigger points produce a deep ache at the attachment on the pubic bone and pain that spreads down the medial thigh toward the knee; people feel it when squeezing the knees together, kicking a ball, or getting out of a low chair (simons2004).

The adductor magnus is the large muscle behind them; its most medial portion refers pain into the groin and along the inside of the thigh, and its upper portion can refer toward the pelvis. The pectineus is a short muscle at the top of the inner thigh that produces a characteristically sharp, superficial pain right in the crease of the groin — a small muscle with a disproportionate complaint (travell1942).

The iliopsoas refers differently: a deep ache in the front of the groin that also climbs into the lumbar region on the same side, classically worse when standing after sitting. Travell described how its referral can mimic intra-abdominal complaints — she called the pattern a pseudo-appendicitis when the referral lands in the lower right quadrant (travell1942, simons2004).

Three smaller contributors matter in stubborn cases. The gracilis, a thin superficial band down the medial thigh, refers pain that stays superficial and close to the muscle. The lower fibers of the rectus abdominis refer downward into the groin and suprapubic area, so a spot on the abdominal wall can be the source of pain felt between the legs. And the sartorius produces a burning or tingling quality along the anterior-medial thigh rather than an ache — a referral character that mimics a nerve problem.

Before treating anything, narrow the list. These checks take five minutes and each one points to a different muscle.

The squeeze test: lie on your back with your knees bent, place a ball or a folded cushion between your knees, and squeeze gently. Pain reproduced in the groin — not elsewhere — points to the adductor group, most often the longus and brevis. If pressing just below the pubic bone on the painful side reproduces your familiar pain, and a sustained pressure hold eases it over thirty to ninety seconds, that is the strongest myofascial finding you can get at home.

The seated knee lift: sit on a firm chair, lift one knee a few centimetres off the seat while pressing down on it with your hand. Pain in the front of the groin or the lower back on the same side points to the iliopsoas. Compare the two sides.

The figure-four position: place the ankle of the painful side on the opposite knee and let the knee drop outward. A deep pull in the groin is normal; pain that reproduces your complaint and eases after thirty seconds suggests the adductors or the pectineus.

The cough test — not for the muscles, but for the hernia question: stand, cough, and watch for a bulge in the groin. A visible bulge that increases with coughing is not a trigger point; it requires medical assessment.

The criterion that carries the most clinical weight throughout is recognition: when pressure on a specific spot reproduces the pain you know, that spot belongs in your treatment plan.

Week one — reduce the load and release. Stop the movement that provokes the pain most: usually sprinting, deep lunges, or heavy adductor work in the gym. Keep walking. Twice a day, apply sustained pressure with a ball (or your thumb) to the tender spot you identified — thirty to ninety seconds, or until the ache eases — then take the muscle through its range slowly once. Finish with a gentle adductor stretch: sitting, soles of the feet together, knees dropping toward the floor, thirty seconds, twice. Never stretch into tingling; the adductors and the iliopsoas attach to bone with short, strong tendons and respond badly to forced end-range work (fernandez2006, vier2019).

Weeks two to four — load the muscle back. Myofascial release without loading lasts only until the next trigger; what keeps the pain away is progressive strengthening. Start with side-lying hip adduction against light resistance, then progress to Copenhagen plank variations — the shortest version, knee supported, is enough to begin. Add hip flexor strengthening: standing knee raises against a band, slow. Return to running or sport when you can do fifteen slow resisted adductions pain-free and hop on the affected leg without pain (espejo2017, cerezo2016, moraska2017).

When it is not myofascial — and this deserves emphasis for the groin specifically, because the differential is wide. Get examined rather than self-treating when: a bulge appears in the groin that increases with coughing or straining (hernia); the pain began with a sudden pop, snap or sharp tearing during movement (acute adductor tear); pain is constant, unrelated to movement, or wakes you at night; there is fever, urinary symptoms, blood in the urine, or — in women — menstrual or pelvic changes; or four to six weeks of consistent self-care produces no change. Deep anterior groin pain that catches or clicks with hip rotation also deserves assessment for hip joint pathology before it is attributed to muscle (quintner2015).