Fast A delta fibers are associated with which type of pain?

• A. Dull, burning pain
• B. Visceral pain
• C. Referred pain
• D. Sharp, intense pain

Answer: (D)

Fast A delta fibers are myelinated, quickly conducting nociceptors that carry the initial, sharp, well-localized pain you feel when you encounter a sudden noxious stimulus. This is the “first pain” you notice, letting you pinpoint the source almost immediately. Because they transmit signals rapidly, the sensation is intense and precisely localized. In contrast, the dull, burning pain comes from slower, unmyelinated C fibers, which produce a lingering, less localized ache. Visceral or referred pains involve different patterns and are often less precisely localized. So the fast, sharp, intense pain matches the fast A delta pathway.