C fibers are a type of nerve fiber found in the human body. They are thin and unmyelinated, which means they conduct signals more slowly than other types of nerve fibers. C fibers are primarily responsible for transmitting pain signals, particularly those associated with dull, aching, or chronic pain. These fibers are part of the peripheral nervous system and play a crucial role in the body's response to injury. When tissue is damaged, C fibers send signals to the brain, alerting it to the presence of pain. This helps the body react appropriately to protect the injured area.