Sudden pain during or right after activity
Localized tenderness in one specific muscle
Muscle feels tight, sore, or stiff
Pain worsens when you use or stretch the muscle
Swelling or mild bruising in the area
Weakness in the affected muscle
Muscle spasms or cramping
Limited range of motion
Pain that improves with rest and worsens with movement
No obvious joint injury, but movement of the muscle hurts