 1. Independently adaption of the UCT questionnaire into Thai version by using forward-backward translation by two bilingual translators. The original German version is translated into Thai by two Thai native speakers, then the study team reviews the Thai-version UCT questionnaire for items comprehensibility and integrates the first consensus version which re-translated into German by German native speaker afterwards. The comparison between the backward German version UCT questionnaire and the original UCT is carried out to find out any misconception and mistranslation in the intermediary forward version of questionnaire. The second version will be tested on 15 chronic urticaria patients to detect any misunderstanding points. Finally, this Thai-version of UCT questionnaire will be used to investigate the validity, reliability, interpretability and minimal clinical important difference. 