Which of the following is a common symptom of musculoskeletal diseases?

Inflammation is a hallmark symptom of musculoskeletal diseases. These conditions often involve the muscles, bones, joints, or connective tissues, and inflammation can occur as a response to injury or disease. It typically manifests as red, swollen, and painful areas, which can restrict movement and lead to further complications.

In chronic conditions such as arthritis, for instance, the body may produce an inflammatory response that causes persistent pain and swelling in the affected joints. This inflammation can affect mobility and overall quality of life, making it a key indicator of musculoskeletal issues.

The other symptoms listed—chest pain, rapid heartbeat, and insomnia—are more closely associated with different medical conditions. Chest pain is often related to cardiac issues or respiratory problems, rapid heartbeat can occur due to various factors including anxiety or cardiovascular conditions, and insomnia typically relates to psychological or sleep disorders rather than directly to musculoskeletal diseases. Thus, inflammation stands out as a significant and relevant symptom within the context of musculoskeletal health.