Vibration Syndrome is characterized by which phenomenon?

• A. Abnormal constriction of the blood vessels of the fingers.
• B. Chronic cough.
• C. Headache.
• D. Itchy skin on palms.

Answer: (A)

The key idea here is the vascular response to vibration exposure in the fingers. Repeated hand‑arm vibration can make the small digital arteries hyperreactive, causing their smooth muscle to constrict strongly in a vasospasm. This reduces blood flow to the fingertips, leading to pallor, numbness, and cold sensitivity—classic signs of vibration‑induced vascular changes.

That’s why the best choice is abnormal constriction of the blood vessels of the fingers. It directly describes the vascular mechanism underlying vibration syndrome. Other options don’t fit because a chronic cough points to the respiratory system, a headache is a nonspecific symptom, and itchy skin on the palms isn’t tied to the vascular constriction seen in this condition.