What a deadlift asks of the shoulders, and what no study has measuredEmerging evidence
You hinge to the bar with your arms straight and pull until you stand tall. The arms only hang, but the load passes through the hands, the elbows, the biceps and the shoulder joint, and the muscles around the shoulder blades (the trapezius, the rhomboids and the serratus anterior) hold the blades against the bar's pull, with the lats keeping the bar close.
No study has measured the rotator cuff, the lats, the shoulder joint's load or the bar's rotation in any deadlift, with any grip. A review of deadlift muscle activity studies reports the legs and back. In 13 football players, the middle trapezius worked harder in the lower part of the pull and the upper trapezius in the last part, near lockout. The only grip study measured forearm muscles, and a thick-handle study reported shoulder muscle activity without splitting the muscles. So this page's map comes from those studies, filmed injuries, lifting surveys and trials of shoulder pain, and says where it uses our reading.
Sources 1, 2, 3, 4
Who gets it: patterns, not percentagesEmerging evidence
The shoulder is one of the commonest sore spots in lifting: 19.6% of powerlifting injuries pooled across reports, 21% of strongman injuries (the biceps 11%), and up to 36% of resistance training injuries in one review. Upper limb injuries are commoner in powerlifters over 40. Injury rates are low: 1.0 to 4.4 per 1,000 hours of powerlifting.
But the deadlift isn't the lift that gets the blame. In 104 Swedish powerlifters, 9 of 16 current shoulder injuries began in bench press training, while deadlift onset went with the lower back and pelvis. A review of injuries by lift found no shoulder injury reported from the deadlift. In United States (US) emergency departments, the commonest causes of gym shoulder injuries were overhead (21.6%) and pushing (14.5%) movements.
No study gives the share of each cause of shoulder pain in a deadlift. The patterns on this page are our reading: the muscles around the shoulder blades working hard on heavy or new pulls, a shoulder already irritated by pressing that complains when the arms hang under load, or the biceps tendon in the underhand arm of a mixed grip.
Sources 5, 6, 7, 8, 9, 10, 11, 12
The mixed grip and the biceps tendon at the elbowEmerging evidence
A mixed grip (one palm facing you, one facing away) holds more weight, and in 29 trained lifters it was the grip rated easiest at every load. Its one known risk is at the elbow, not the shoulder. In 35 filmed tears of the biceps tendon at the elbow in strength sports, 25 happened in deadlifts, and all 24 mixed-grip tears were in the underhand (palm forward) arm, with the elbow straight. Two more video series found deadlifting in 67% and 71% of filmed tears.
Videos can't give a rate, though: only 1 of 22 consecutive clinic patients with the tear had been deadlifting. The tear itself is rare, about 1.2 to 2.55 per 100,000 people a year, about 95% of them men, at an average age of about 46, and it is commoner in people who smoke or use steroids. So the site's deadlift guide keeps its advice: if you use a mixed grip, swap which hand is underhand, or use a hook grip or straps for your heaviest sets.
Sources 3, 13, 14, 15, 16, 17, 18
The front, the top and the back of the shoulderEmerging evidence
A sore biceps tendon in the groove at the front of the shoulder is treated with exercise and changed loading, but that rests on expert opinion rather than trials. A torn long head of the biceps rarely needs surgery, and most people keep good function.
Bone stress at the end of the collarbone (distal clavicle osteolysis) showed on X-ray in 7 of 25 competitive weightlifters and none of 25 men who didn't train, and bench pressing is the commonest activity behind it (49.1% of 483 patients in a review).
Rarer causes are on record: a torn lat or teres major, mostly in throwers but reported in weightlifters, and nerve injuries that make a shoulder blade stick out. In one clinic, 11 nerve injuries causing a winged shoulder blade were sport-related, and most of those people had lifted weights; one young weightlifter had a first rib fracture with a winged shoulder blade.
Sources 19, 20, 21, 22, 23, 24, 25
The neck can send pain to the shoulder bladeEmerging evidence
In 50 people with a trapped nerve in the neck, pain in the neck or shoulder blade area came before the arm symptoms in 70%, and a review of 86 studies found shoulder blade pain described in 72%. The link runs both ways: in 30 of 34 people with neck pain near the top of the shoulder blade, the pain eased at once after an injection into the shoulder. NHS inform says a trapped nerve usually starts to improve within 12 weeks.
Sources 26, 27, 28, 29
When a scan or test helps, and what it can't tell youStrong evidence
Not at first for an ache around the shoulder blades or a sore front of the shoulder that eases with changed training. In 96 shoulders without symptoms, a magnetic resonance imaging (MRI) scan showed a rotator cuff tear in 34%, and 54% over 60. The NHS says a health professional will examine you and might send you for tests such as an X-ray.
Tests matter for a suspected biceps tear at the elbow (an examination, sometimes an ultrasound or MRI, and soon, because repair is ideally done in the first 2 to 3 weeks), a shoulder that has slipped, sudden weakness after an injury, a shoulder blade that sticks out, pain on top of the shoulder that hasn't settled, and worsening nerve signs. Neck and shoulder problems often show together on scans, so a report has to match your symptoms.
Sources 30, 31, 18, 22, 32
How it usually goesEmerging evidence
Muscle aches settle within days. The NHS says shoulder pain usually needs 2 weeks of looking after before it starts to ease, and it can take 6 months or longer. In 349 people with new shoulder pain in general practice, 23% had fully recovered at a month and 59% at a year, faster when it followed overuse or a slight strain; across studies, about half of new episodes recover within 6 months, and neck pain alongside it predicts a slower course. In the largest rotator cuff trial, every group improved a lot over a year. Most injured powerlifters keep training with changes, and after a biceps tendon repair, 183 strength athletes all returned to their sport. No one can promise a date.
Sources 31, 33, 34, 35, 36, 10, 37