There is no such thing as an onset cycle for urticaria. The rash of urticaria comes and goes, and when acute urticaria occurs, the rash will fade away completely without leaving a trace and will not recur. For chronic urticaria with a long history, which can reach more than 6 weeks, the rash appears irregularly and can subside on its own. It is advisable to follow regular treatment as prescribed by the doctor and also to pay attention to the presence of connective tissue disease, or thyroid disease, stomach disease, etc. If other diseases are present, they need to be corrected in a timely manner, otherwise hives are difficult to cure completely. Patients with urticaria also need to avoid hot and cold stimuli. Hives can appear after exposure to triggering factors, and there is no such thing as a cycle.