What Is a Strain?
A strain is an injury to a muscle or tendon caused by overstretching, excessive force, or repeated loading. It may affect the tissue where a muscle meets a tendon and can produce localized pain, tenderness, weakness, swelling, or limited movement. Work-related lifting, reaching, pulling, and sudden movements can contribute to a strain.
Quick Facts About Strain
Category
Muscle or tendon injury
Used for
Work-related soft-tissue complaints
Common confusion
Sprain affects a ligament
Also called
Muscle injury, Muscle strain
Often discussed with
Work Injury Treatment
Key Takeaways About Strain
- Strains affect muscles or tendons, not ligaments.
- Work tasks may involve lifting, pulling, reaching, or repeated loading.
- A strain is commonly confused with a sprain.
How Strain Works
Strain describes how muscle or tendon tissue responds when force, stretch, or repeated activity exceeds its current tolerance. Small tissue disruptions may trigger local inflammation and protective muscle guarding. Symptoms often stay near the affected area, although discomfort can change with movement or pressure.
Related glossary terms: Sprain, Muscle Spasm, Muscle Tension.
Work-related assessment considers the task, the body position, and the movement that brought on symptoms. A clinician may compare tenderness, strength, flexibility, and movement between sides. A sprain involves a ligament, while a muscle spasm describes involuntary tightening that may occur with pain or irritation. These terms can appear together, but they describe different findings.
From the Arrowhead Clinic Chiropractor McDonough team
When we evaluate a suspected strain, we ask how the work task began, which movement changes the symptoms, and whether weakness or restricted motion is present. We also consider nearby joints and nerves because pain in one area can involve more than one tissue.
Strain in Practice: A Real-World Example
A warehouse worker lifts a box while twisting and develops pain across the lower back. A work injury evaluation may examine the involved muscles, movement pattern, and related areas before identifying strain as part of the clinical description.
Related Services
Related Terms
Sprain
A sprain is an injury to a ligament, the tough tissue that connects one bone to…
Muscle Spasm
A muscle spasm is a sudden, involuntary tightening of muscle fibers that can limit movement and…
Muscle Tension
Muscle Tension is a state in which muscle fibers remain partly contracted or feel tight during…
Acute Injury
Acute Injury is a sudden injury caused by a specific event, such as a collision, fall…
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