Experiencing discomfort during a standard bodyweight exercise is a common scenario, yet the specific issue of why do push ups hurt my shoulders often points to a misalignment between movement pattern and physical capacity. The shoulder joint is a highly mobile ball-and-socket structure that relies on surrounding muscles for stability, and pain usually signals that this balance has been disrupted. Rather than a simple lack of strength, the issue is frequently rooted in technique, mobility restrictions, or improper training progression. Understanding the intricate mechanics of the shoulder blade and upper arm bone interaction is the first step toward eliminating the ache and building a more resilient physique.
Anatomy of the Shoulder During the Push Up
To address the pain, one must first visualize the anatomy at work. When the body lowers toward the floor, the humerus (upper arm bone) rotates within the glenoid fossa (socket) of the scapula (shoulder blade). This motion requires the scapula to rotate upward and outward, a movement controlled by the serratus anterior and trapezius muscles. If these muscles are weak or inactive, the scapula "winges" or tilts incorrectly, pinching the soft tissues and tendons in the subacromial space. Consequently, the primary reason push ups hurt my shoulders is often a lack of scapular stability rather than weakness in the chest or triceps.
The Role of the Rotator Cuff
While the larger muscles like the pectorals get the spotlight, the rotator cuff acts as the primary dynamic stabilizer for the joint. This group of four small muscles—supraspinatus, infraspinatus, teres minor, and subscapularis—holds the humeral head centered in the socket during the push up. If these muscles are imbalanced or fatigued, the head of the humerus can drift upward, impinging the acromion bone against the tendons. This impingement is a direct mechanical cause of shoulder pain during the exercise, as the space for soft tissue narrows under load.
Common Technical Errors
Even with adequate strength, poor execution can overload the joint. One of the most frequent errors is flaring the elbows outward at a ninety-degree angle from the torso. This position places the rotator cuff in a mechanically disadvantaged position, increasing friction and stress on the front of the shoulder. Furthermore, allowing the hips to sag creates a lever that forces the shoulder to bear excessive weight, turning a stability exercise into a joint-compression exercise. Maintaining a rigid plank from head to heels is essential to distribute the load evenly across the chest and shoulders.
Range of Motion and Mobility Restrictions
Another critical factor in why do push ups hurt my shoulders relates to the available range of motion in the thoracic spine and latissimus dorsi. Modern lifestyles involving prolonged sitting lead to tight chest muscles and a rounded upper back. This tightness prevents the shoulders from extending fully without placing strain on the joint. If the thoracic spine is stiff, the body compensates by overextending the lower back or hiking the hips, which indirectly forces the shoulders to absorb unwanted pressure. Assessing flexibility in these areas is crucial for identifying the root cause of the discomfort.
Elbow flare exceeding 45 degrees from the body.
Insufficient thoracic spine mobility causing compensatory arching.
Weak serratus anterior leading to scapular winging.
Tight pectoral muscles restricting proper shoulder flexion.
Overloading the joint before establishing proper motor control.
Imbalanced strength between pushing and pulling muscle groups.
