weigh in. Be weighed; also, be of a particular weight. For example, Because it was such a small plane, the passengers and their luggage had to weigh in before takeoff , or The fish weighed in at 18 pounds. [Late 1800s] See also: weigh.
Asthma and allergic diseases, such as allergic rhinitis (hay fever), food allergy, and atopic dermatitis (eczema), are common for all age groups in the United States.
Allergy and asthma - immune responses to substances that are usually not harmful. Immune deficiency diseases - disorders in which the immune system is missing one or more of its parts. Autoimmune diseases - diseases causing your immune system to attack your own body's cells and tissues by mistake.