Because the base of the tongue is devoid of pain fibers, these tumors are often asymptomatic until they have progressed significantly.

Supertasters, who have a denser field of pain fibers, had the greatest increase in pain sensation.

Its superior and inferior (petrous) ganglia contain the cell bodies of pain fibers.

A patient usually does not feel the tube being pushed because the inner surface of the bowel has few pain fibers.

In some conditions, excitation of pain fibers becomes greater as the pain stimulus continues, leading to a condition called hyperalgesia.

They are susceptible to environmental pollutants, infection and, because the lungs have no pain fibers, to the silent growth of tumors.

Researchers began to pursue physical treatments such as cutting specific pain fibers to prevent the painful signal from cascading to the brain.

The structure of pain fibers and slow- touch fibers are similar, Dr. Olausson said.

While there are no pain fibers in the retina, vitreous traction may stimulate the retina, with resultant flashes that can look like a perfect circle.

Diabetic neuropathy affects all peripheral nerves including pain fibers, motor neurons and the autonomic nervous system.