Depending on the underlying cause, pain in your left arm may be mild, moderate, or severe. It might radiate down your arm ...

When left arm pain does not have a known cause, comes on suddenly, or is severe, seek immediate medical attention. A ...

Pain in the arm (shoulder to fingers) Includes shoulder ... A strained muscle hurts for 2 or 3 days. The pain often peaks on day 2. After severe overuse, the pain may last a week.

Arm pain, especially on the left side, can happen during a heart attack because the nerves in the heart and arm are connected. When the heart isn’t getting enough blood, the pain can be felt in ...