Apart from the teacher quality, the student motivation, the curricula and textbooks, the assessment methods, and other supporting factors such as teaching aids, class sizes, and time allocation are often said to exacerbate the English language teaching problems in Thailand. Thus, with the present unsatisfactory results of English language teaching and learning and obvious desires for professional development of English teachers, the researcher aimed to get a clearer picture of the problems secondary school teachers are facing and to find out if those teachers need any kind of professional development.