What could cause outer elbow pain when bending and straightening the arm?

Outer elbow pain during arm movement is most often caused by lateral epicondylitis, commonly known as tennis elbow. This condition develops when the tendons attaching to the outer elbow (lateral epicondyle) become strained, inflamed, or injured—typically from repetitive gripping, lifting, or wrist motions.

Key facts about tennis elbow:

• Main symptom: Pain on the outer elbow that worsens with arm movement, gripping, or twisting.
• Common causes: Repetitive strain, overuse, or sudden injury to the forearm tendons.
• Who it affects: Not just athletes—painters, plumbers, typists, and office workers are frequently affected.
• Typical treatment: Rest, ice, stretching, physical therapy, and anti-inflammatory medication.

Because outer elbow pain can also stem from nerve issues, arthritis, or referred pain from the neck, identifying the true cause matters. A free, instant, online symptom check can help you clarify your symptoms, rule out serious conditions, and understand what next steps to take—so you can move forward with confidence rather than guesswork.

Reviewed for medical accuracy: 07/15/2026