Chronic spontaneous urticaria (CSU) is a condition characterized by the daily occurrence of wheals, with or without angioedema, persisting for more than six weeks, without any identifiable triggering factor. CSU is caused by the abnormal activation of mast cells and basophils and the release of histamine, resulting in itching and skin lesions that can significantly impact patients' quality of life. Diagnosis is primarily based on clinical observation and the exclusion of other conditions, while standard treatment involves the use of second-generation antihistamines, with the addition of omalizumab for more resistant cases.