What symptom is most commonly associated with atopic dermatitis?

Atopic dermatitis, also known as eczema, is primarily characterized by intense itching. This itching is a hallmark symptom and often precedes the visible signs of the rash, making it one of the most distressing aspects for those suffering from this condition. The itching can lead to scratching, which may exacerbate the skin's condition, causing inflammation and further discomfort.

While other options such as fatigue, fever, and swelling can be associated with various skin conditions or systemic illnesses, they are not typical primary symptoms of atopic dermatitis. Fatigue may occur indirectly due to discomfort or disturbed sleep caused by itching. Fever is generally not linked to atopic dermatitis itself but can indicate an infection or another systemic issue. Swelling may occur as a result of scratching or secondary infection, but it is not an inherent characteristic of the condition. Thus, itching remains the most defining and common symptom associated with atopic dermatitis.