A groin strain is an injury to the adductor (inner-thigh) muscles or their tendons, usually from a sudden stretch, sprint, kick or change of direction. Most settle with sensible early care and a progressive return — but they're also one of the most recurrent sports injuries, because people return to full speed before the tendon has rebuilt capacity. Knowing the grade, the realistic timeline, and how to load it back up is what separates a one-off strain from a recurring problem.
What a groin strain feels like
The classic presentation: sudden inner-thigh or groin pain during sprinting, kicking, twisting, or a fast change of direction. Often sharp at the moment of injury, then settling to a deep ache that worsens when the muscle is loaded.
Common signs to look for:
- Tenderness along the inner thigh, often over a specific point of the adductor muscle or tendon.
- Pain when squeezing the legs together (resisted adduction) — often the most sensitive test.
- Pain when stretching the legs apart (passive abduction) — a tight, pulling sensation in the inner thigh.
- Bruising or swelling in moderate to severe strains, sometimes extending into the upper thigh or lower abdomen.
Grades and healing time
Groin strains are graded by the extent of fibre damage. The grade guides the timeline — but return to sport depends on regained strength and control, not the calendar.
| Grade | What's damaged | Typical timeline | What it usually means |
|---|---|---|---|
| Grade 1 | Minor fibre damage — small tear or overstretch of muscle fibres | Days to ~2 weeks | Painful but functional. Often settles with sensible early care and a progressive return. |
| Grade 2 | Partial tear — a clear, larger disruption of muscle or tendon fibres | A few weeks (often 3–8) | More painful, clear weakness, sometimes bruising. Needs progressive loading and a graded return. |
| Grade 3 | Major or complete tear of the muscle or tendon | Months; occasionally needs specialist input | Significant pain, clear loss of strength, often visible bruising. Specialist assessment recommended. |
Timelines are a guide, not a promise. Two people with the same grade can recover on very different timelines, depending on how the loading is progressed, what the sport demands, and whether the original diagnosis was right in the first place.
What to do early (first days)
The instinct is either to do nothing or to test it by sprinting. Both are wrong.
- Relative rest from the aggravating movement — not full rest, just stop doing the thing that hurts.
- Gentle pain-free movement as comfort allows — short walks, gentle range work, light adductor activation.
- Avoid the "test it" trap — a single premature sprint or kick is the most common way a mild strain becomes a moderate one.
- Early gentle loading is better than complete rest, as comfort allows. The adductor tendon responds to controlled load — full rest leaves it under-prepared and more prone to re-injury.
How to treat it so it doesn't come back
The recurrence-prevention key is progressive adductor loading — rebuilding strength through range before returning to sprinting, kicking and cutting, then a graded return to sport. Skipping this stage is the usual reason groin strains recur.
A typical progression: isometrics → through-range strength (Copenhagen adduction, sliding, controlled band work) → running and cutting → sport-specific work. Each step is gated on the previous one feeling genuinely strong, not just pain-free at rest.
If the strain isn't settling, or the pain keeps returning each season, the broader groin pain pillar page covers what else might be going on and when the diagnosis is worth revisiting.
When it's not "just a strain"
Persistent or recurring groin pain can come from structures other than the adductors — and treating it as a recurring adductor strain is a common reason the problem never goes away. Worth being aware of:
Hip-joint problems (FAI or labral tear)
The hip joint itself can present as groin pain — particularly with deep flexion, sitting, and rotational load. If the pain is more "in the joint" than "in the muscle," or comes with catching, the strain label may be masking an intra-articular problem.
→ FAI and labral tears explained →Iliopsoas-related groin pain
The deep hip flexor can become overloaded or irritated, producing groin pain that mimics an adductor strain — but the loading pattern and the rehab are different. Tenderness is often higher and deeper than an adductor problem.
Inguinal or "sports hernia"
Pain at the lower abdomen / inner groin junction that doesn't sit clearly in the adductor muscle, often worse with coughing or sit-ups, can indicate an inguinal or athletic pubalgia issue. This needs a different pathway — typically medical, sometimes surgical.
Red flag: severe pain, visible deformity, or unable to bear weight
A "pop" at the moment of injury, severe pain, a visible lump or gap in the muscle, or inability to bear weight should be assessed promptly — these features can indicate a complete tear or other significant injury that benefits from early specialist input.
When to see a specialist
Get assessed if a groin strain is severe, isn't improving over the expected window, or keeps recurring each time you return to sport. A specialist hip and groin assessment can identify whether the original diagnosis was complete — and what loading progression actually fits the individual.
Groin strain that keeps coming back?
John Gravenall offers specialist hip and groin assessments in London, the Midlands, and online.
Book a specialist hip assessment →Frequently Asked Questions
How long does a groin strain take to heal?
Roughly days to two weeks for a mild (Grade 1) strain, a few weeks for a moderate (Grade 2) strain, and months for a severe (Grade 3) strain. Return depends on regained strength and control, not just the calendar.
Should I rest or exercise a groin strain?
Brief relative rest early, then progressive loading. Complete rest tends to leave the muscle under-prepared and more prone to re-injury — gentle early loading within pain limits helps the tissue recover more reliably.
Why does my groin strain keep coming back?
Usually because full speed is resumed before adductor capacity has been rebuilt, or because the original diagnosis was incomplete — hip-joint (FAI/labral) pain, iliopsoas problems and inguinal or 'sports hernia' issues can all mimic an adductor strain.
What can be mistaken for a groin strain?
Hip-joint problems (FAI and labral tears) can present as groin pain, as can iliopsoas-related issues and inguinal or 'sports hernia' conditions. When groin pain keeps recurring, the diagnosis is worth revisiting.