Synonyms to apple of discord

tender spot, ache, aching, affront, blow, bone of contention, bone to pick, casus belli, cramp, crow to pick, crow to pluck, cut, distress, dolor, exposed nerve, grief, grounds for war, hurt, injury, lesion, nasty blow, nerve ending, offense, pain, pang, passion, provocation, raw, raw nerve, red rag, rub, shock, soft spot, sore, sore point, sore spot, spasm, stress, stress of life, stroke, suffering, the quick, throes, ticklish issue, wound, wrench, catechism, cross-interrogatory, cross-question, debating point, demand, feeler, inquiry, interrogation, interrogative, interrogatory, issue, leader, leading question, moot point, point at issue, point in question, problem, query, question, question at issue, question mark, quodlibet, topic, trial balloon, vexed question, Discordia, Eris, ablate, abrade, abrase, afflict, aggravate, agonize, ail, air-dry, anhydrate, annoy, attouchement, bake, bandage, bar, bark, bathe, bit