What a push-up asks of the shoulder, and how common the pain isEmerging evidence
A push-up lowers your body between your hands, so at the bottom the arms are behind your body and the shoulder carries about two-thirds of your weight: about 64% of body weight was on the hands in a floor push-up in a lab study of 23 young adults, and about 66% in another of 8 men. Most shoulder pain in adults comes from the rotator cuff and the tissues around it: GRASP, a large UK trial, reports rotator cuff disorders as the cause in about 70% of people.
In people who lift, the shoulder is one of the commonest places to get hurt: up to 36% of resistance-training injuries in one review, and the commonest site (7.4% in 6 months) in a survey of 393 gym members. No study counts how often push-ups themselves cause shoulder pain, or measures the force on the shoulder joint during one, so the map on this page comes from what each condition is known to do.
Sources 1, 2, 3, 4, 5, 6, 7
Where it hurts sorts the causesEmerging evidence
Rotator cuff related pain is the commonest: the NHS describes "pain at the top and the outside of your shoulder", worse when you lift your arm, and a UK care pathway calls it a clinical diagnosis. Pain or tenderness in the groove at the front, sometimes with an occasional snap, points to the long head of the biceps; clinical tests for it are poor, and an ultrasound scan is more reliable.
Pain on top, where the collarbone meets the shoulder, is the AC joint. In people who press a lot, it can be weightlifter's shoulder (distal clavicle osteolysis), a stress reaction at the end of the collarbone: bench pressing was the activity in 49.1% of 483 published cases. Deep, vague pain at the back can be the joint slipping backwards: a review says "The contact athlete will often complain of pain with push-ups and bench press", though this is only 2% to 5% of shoulder instability.
Sources 8, 9, 10, 11, 12, 13, 14, 15, 16
"It only hurts at the bottom"Emerging evidence
The bottom is where the arms are furthest behind the body, the shoulder blade has to tilt and turn the most, and the hands carry the most weight; in 28 strength-trained men, less weight was on the hands at the top than the bottom. That is where rotator cuff, biceps and AC joint pain usually show first (our reading). No study has measured the forces in the shoulder joint at the bottom of a push-up; the nearest is a computer model of the bench press, in which wide grips raised the load on the shoulder joint and the AC joint.
Sources 17, 18, 19
What a scan shows, and what it doesn'tStrong evidence
Scans find a lot in shoulders that don't hurt: rotator cuff tears in 34% of 96 people on MRI (magnetic resonance imaging), more with age; AC joint arthritis in 48% to 95%; and labral tears read in 55% to 72% of people aged 45 to 60. A UK care pathway says subacromial pain "is a clinical diagnosis" and imaging "is not essential to confirm the diagnosis or start treatment".
A scan helps after an injury (a suspected dislocation is X-rayed), for a shoulder that slips that isn't settling (an MRI or an MRI with dye in the joint), and for pain on top of the shoulder in a lifter that isn't settling after changed training. The pathway refers pain that hasn't improved after 12 weeks of non-surgical care to a specialist.
Sources 9, 20, 21, 22, 23, 24, 15, 13
How it usually goesEmerging evidence
In 349 people with new shoulder pain in Dutch general practice, 23% had recovered at 1 month and 59% at 12 months; recovery was quicker after overuse or a slight injury and slower with neck pain or severe daytime pain. A UK pathway says most subacromial pain responds within three months, and in the GRASP trial every group improved a lot over a year. The NHS says shoulder pain can take 6 months or longer to recover, and NHS inform expects new pain to begin to settle within 6 weeks. No one can promise a date.
Sources 25, 9, 5, 12, 26