An allergic reaction is your body’s response to a substance that it deems dangerous or potentially deadly. Spring allergies, for example, are caused by pollens or grasses. A deadlier type of allergic ...

Allergic reactions are caused by allergens that you’ve come into contact with. Many things can cause allergies, from foods to pets to dust. With diagnosis, effective treatment is possible. An allergic ...

Leukemoid reaction and chronic myeloid leukemia (CML) can both cause a high white blood cell count. However, they typically increase the levels of different types of white blood cells. CML and ...

Infusion reactions, also known as acute infusion reactions or infusion-related reactions, are common adverse effects that can occur when a person receives medication intravenously. Infusion reactions ...

Drug reaction with eosinophilia and systemic symptoms (DRESS) is a T-cell–mediated severe cutaneous adverse reaction characterized by rash, fever, internal organ involvement, and systemic ...