These words meaning "even though," "regardless," "in spite of the fact that" may be used interchangeably in most instances: "Although I was nervous, I got to my feet." "Though I was nervous, I got to my feet." However, although is more commonly used at the beginning of a sentence. Though is the more commonly used word in linking words and phrases (sadder though wiser man) and is preferred over although at the end of a statement (He looked healthy to me, though).
Dictionary of problem words and expressions. Harry Shaw. 1975.