Had 1st half of root canal, due for 2nd half next week. have a pea sized node swollen under jawline, on side of infected tooth. it this from rt canal?

Root canal: The infected tooth has not yet healed. If the swelling was not present before the root canal was started, the swelling is most likely a response to the infection, to the root canal procedure itself, or to both. Contact the treating dentist for guidance on how they want to treat the swelling.

Could be: An enlargement in this area could be a pocket of infection from the tooth or a lymph node, so its is hard to say. It is important to note that the root canal treatment is done to resolve these issues, but healing takes time. Have your dentist/endodontist evaluate the area when you go back for the second visit. Your dentist can evaluate you and determine the best action to take.

May be: It could be from that unfinished root canal tooth that got infected, call your dentist for treatment ..