Causes
Causes of localized symptoms include:
- neurotoxicity due to allergenic reaction,
- excessive fluid pressure in a confined space,
- severing of nerve fibers or support tissue with the needle/catheter,
- injection-site hematoma that puts pressure on the nerve, or
- injection-site infection that produces inflammatory pressure on the nerve and/or necrosis.
Read more about this topic: Local Anesthetic, Undesired Effects, Localized Adverse Effects