Is swelling in the appendix area bad?

I assume: You mean swelling the right lower abdomen. Often this could be a symptom of bowel gas or constipation. If there is pain, tenderness, nausea, vomiting, fever, loss of appetite, etc. Then appendicitis can cause those symptoms. However, if it just feels a little puffy in the right lower abdomen it likely isn't appendicitis. See a doctor if you remain concerned.