What can cause paresthesia?

Paresthesia, which refers to abnormal sensations such as tingling, prickling, or numbness, can indeed be caused by hemorrhage around a nerve. When there is bleeding or the accumulation of blood in the area adjacent to a nerve, it can exert pressure on the nerve, leading to these abnormal sensations. This could occur during the administration of local anesthesia if a blood vessel is inadvertently punctured, causing localized bleeding that may impact nearby nerves.

While other factors can also contribute to paresthesia in certain situations, the mechanism of hemorrhage directly affecting nerve function through pressure is a well-documented cause. This condition can lead to temporary or, in rare cases, prolonged paresthesia if the nerve is significantly affected. Understanding the anatomical relationships of nerves and blood vessels during dental procedures is crucial for minimizing risks associated with local anesthesia.