Which of the following is a common red flag symptom?

• A. Shortness of breath
• B. Night pain
• C. Chest tightness
• D. Headache

Answer: (B)

Red flags signal potential serious pathology beyond a simple mechanical problem and point to the need for medical referral. Night pain is a standout red flag because pain that wakes someone or worsens at night is not typical of routine musculoskeletal strain and often raises concern for conditions like cancer, infection, or inflammatory disease. That makes it the most important indicator among the given symptoms.

Shortness of breath and chest tightness are serious signs too and would trigger urgent evaluation, especially if new, severe, or accompanied by other symptoms, since they relate to cardiopulmonary issues. Headache can be a red flag in some contexts, but on its own it’s less specific as a common red flag in a musculoskeletal screening.