Shoulder Impingement or DOMS?

Distinguishing between shoulder pain/impingement and delayed onset muscle soreness (DOMS) in the deltoid muscle involves considering the characteristics of each condition, the context in which the pain or discomfort occurred, and any additional symptoms or factors that might be present. Here is a breakdown to help you differentiate between the two.

1. Location of Pain:

• Shoulder Pain/Impingement: The pain associated with shoulder impingement is usually felt around the top and outer part of the shoulder, often radiating down the arm. It might be more localised to the joint itself.

• Deltoid DOMS: DOMS typically presents as generalised muscle soreness within the deltoid muscle. It might be spread across the entire muscle rather than being pinpointed to a specific joint.

2. Onset and Duration:

• Shoulder Pain/Impingement: Pain due to impingement tends to develop gradually over time, often due to overuse or poor shoulder mechanics. It can persist and worsen with specific movements.

• Deltoid DOMS: DOMS usually occurs within 24 to 48 hours after engaging in unfamiliar or intense physical activity, such as weightlifting or a new exercise routine. It tends to improve over a few days.

3. Nature of Pain:

• Shoulder Pain/Impingement: The pain can be sharp intense, and may limit the range of motion in the shoulder. It might be exacerbated by specific movements, such as lifting the arm overhead or reaching across the body.

• Deltoid DOMS: The soreness associated with DOMS is usually described as a dull ache, stiffness, or tightness in the muscle. It tends to be more noticeable when the muscle is stretched or contracted.

4. Triggering Activities:

• Shoulder Pain/Impingement: Pain due to impingement is often triggered by activities that involve raising the arm, reaching, lifting, or overhead motions.

• Deltoid DOMS: DOMS is typically triggered by eccentric muscle contractions (lengthening of the muscle under tension), such as the lowering phase of weightlifting exercises.

5. Additional Symptoms:

• Shoulder Pain/Impingement: Impingement-related pain might be accompanied by weakness, numbness, or tingling in the arm and hand. There could also be a limited range of motion and difficulty performing specific tasks.

• Deltoid DOMS: DOMS is primarily characterised by muscle soreness without neurological symptoms like weakness, numbness, or tingling.

6. History and Context:

• Shoulder Pain/Impingement: Consider if there is a history of shoulder injuries, poor posture, or repetitive overhead activities that could contribute to impingement.

• Deltoid DOMS: Consider whether you have recently engaged in new or strenuous activities targeting the deltoid muscles.

If you are uncertain about the cause of your discomfort, it is always advisable to consult a medical professional, such as a physician or physical therapist. They can provide a proper assessment, diagnosis, and recommendations for treatment or management based on your specific situation.