What is a common symptom of hypereosinophilia?

Hypereosinophilia is characterized by an elevated level of eosinophils in the blood, which can lead to a variety of symptoms primarily related to hypersensitivity and allergic reactions. Asthma is a common manifestation associated with hypereosinophilia due to the role of eosinophils in the inflammatory process in the airways. Elevated eosinophil levels can trigger bronchial hyperreactivity and inflammation, leading to asthma symptoms like wheezing, coughing, and difficulty breathing.

In contrast, while hives, persistent fever, and skin rashes can also occur in the context of eosinophilia, they are not as directly linked to the condition as asthma is. Hives and skin rashes may be more generalized allergic responses, and fever typically indicates an infectious or inflammatory process rather than directly pointing to hypereosinophilia. Thus, asthma stands out as a primary and common symptom of hypereosinophilia due to the direct effects of eosinophils on the respiratory system.