Othello's internal conflict is jealousy. It is because Iago is saying things which is making him jealous and hate his wife and also see peoples actual identity. His external conflict is his race because he is black and higher ranked then Iago which is making him angry and making him get rid of him. Also marriage is the external conflict to because its falling apart and effecting his rank/ position. The three more conflicts are, Iago trying to ruin Cassio for getting the position that he deserved,  also for some reason he is jealous of him. Iago also wants to destroy Othello's life because of his race and not giving him what he wanted. Also destroy his marriage by making him think that Cassio is having a fling and to kick him out of his position and technically get both of them killed.