What disease causes skin itching?

Skin itching may be caused by various factors, including but not limited to skin diseases, systemic diseases, infections, and others. Common skin conditions such as eczema, urticaria, and contact dermatitis often present with skin itching symptoms. Additionally, systemic diseases like diabetes, hepatobiliary disorders, and thyroid problems can also lead to skin itching, especially when the disease causes metabolic abnormalities or toxin accumulation in the body. Furthermore, infections caused by various pathogens, such as bacterial or fungal infections of the skin, can also result in skin itching. It is worth noting that persistent skin itching over a long period might be a sign of certain diseases, such as malignancies, and therefore should not be ignored. Skin itching may indicate various underlying diseases and requires diagnosis based on specific symptoms and medical examinations.