Chronic spontaneous urticaria (CSU) is a disease that makes people's lives miserable with unknown etiology. In recent years, there have been many studies trying to explain the etiology of CSU, and many of them reported that there are some comorbidities or triggering factors related to CSU. However, it has not been clearly known yet that whether these conditions are true comorbidities associated with CSU or they are coincidentally found at the same time. In this chapter, related comorbidities and conditions have been told.