Chronic Spontaneous Urticaria, an autoimmune skin disease, affects around 1.8% of the world's population
Urticaria, more commonly known as hives, is a skin condition characterized by red, swollen marks that appear in the body. It causes mild to severe itching, and sometimes induces burning sensations.
As with other allergic reactions, urticaria is often mild and disappears on its own, but in serious cases, they can cause anaphylaxis, which is when the body's immune system overreacts to a trigger.
The United States National Library of Medicine's National Center for Biotechnology Information refers to CSU as a condition where "persistent symptoms" of hives appear "for 6 weeks or more."
The chronic disease can be distressing to those who have it, as it often causes disturbance in sleep, lack of energy, isolation, and anxiety.
It is also more common in females than males, and symptoms usually surface among people aged 20 to 40.