A muscle pain or a sprain can occur due to many reasons. Viral infections or exerting the body amongst other factors, can trigger muscle pain. A sprain is a tear or pull caused when a muscle is overstretched or torn. Though not all parts of the body are easily sprained, knees, ankles and wrists are most likely to be twisted. For muscle aches and sprains that are mild to moderate, Zandu products can offer temporary relief.