A barbed needle causes pain upon what action?

When a barbed needle is withdrawn, it can cause significant pain primarily due to its design. Barbed needles feature small hooks or barbs along their surface, which are intended to anchor the needle in tissue. When the needle is inserted, it passes through the tissue relatively smoothly. However, upon withdrawal, the barbs tend to catch on the tissue fibers, causing a tearing action that can lead to increased pain and discomfort.

This contrasts with the other actions such as insertion, where the needle may cause some pain but not as much as during withdrawal due to the trajectories typically followed and the smooth surface during that action. Stabilization refers to keeping the needle in place, which does not generally induce pain. Rotation of the needle, while it may feel uncomfortable due to movement in the tissue, does not typically elicit the same degree of pain as withdrawing the needle due to the tearing effect associated with the barbs.