The pectoralis major is a large chest muscle that attaches to the humerus (upper arm bone) via a broad tendon. It gets injured most often during heavy bench press with excessive shoulder extension, during sudden pulls (like catching a falling object), or in contact sports.
The grading
- Grade 1 — strain / mild tear. Localized pain, no visible deformity, strength largely preserved.
- Grade 2 — partial tear. Bruising, swelling, visible dimpling or asymmetry, notable weakness.
- Grade 3 — complete tendon rupture. Sudden pop, immediate weakness, dramatic bruising down the arm, obvious deformity of the chest and armpit contour.
What to do immediately
Grade 1 — ice, sling for comfort, modify aggravating movements, get assessed within a week.
Grade 2-3 — see a physician quickly. Complete ruptures, especially in active adults, often need surgical repair within 3-6 weeks for best outcomes.
Rehab for grade 1 and 2
Early phase (weeks 1-3) — pain-free range of motion, gentle isometrics, protect the healing tissue.
Loading phase (weeks 3-8) — progressive strengthening starting with resistance bands, moving to dumbbells, focusing on eccentric control.
Sport-specific phase (weeks 8+) — return to bench press with lighter loads, tempo work, and gradual progression to normal training.
Manual therapy — soft tissue work on the pec and surrounding muscles reduces scarring and improves mobility. Joint mobilization for the sternoclavicular joint and thoracic spine restores upstream mobility.
Return-to-bench-press rules
Full pain-free range of motion first. Bench with a slightly narrower grip and controlled range initially. Never a low-bar / flared-elbow position until well recovered. Consider swapping to floor press or dumbbells for the first month back.
Preventing re-injury
Post-recovery, most patients benefit from balanced upper body work — rows, pulls, and posterior shoulder strength. A pec-dominant program with weak upper back is a re-injury waiting to happen.
If you've had a pop or dramatic pull in the chest during lifting, don't wait — early assessment matters, especially for complete ruptures where surgical timing affects long-term function.