Trigger points in the Serratus posterior superior frequently cause pain near or under the shoulder blades, or in other regions throughout the upper extremities.

Pain from the SPS is often described as a constant "deep ache" under the upper portion of the scapula. Pain can extend down the posterior aspect of the shoulder and arm to the ulnar side of the forearm, hand and little finger. It sometimes manifests as numbness into the C8T1 distribution of the hand.

The pain often increases when the patient performs movement that causes the scapula to press against the trigger points of the SPS. Movements include lifting objects with outstretched hands, such as placing dishes or other objects on a shelf. Sleeping on the same side can also cause the scapula to press against the trigger points.

The trigger points in the Serratus posterior inferior may cause symptoms of pain in the torso, primarily back pain in the thoracic area. Symptoms include aching in the low back often mistaken for kidney pain, pain in the low back when stretching overhead, pain in the lower back when twisting around at the waist, and pain in the low back when bending over.

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