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.
Sometimes we (okay, I) get so caught up in describing pathologic mechanisms that real-life examples get the short end of the stick. Let's look at some real diseases in which the underlying problem is a hypersensitivity reaction. Type I (allergic) hypersensitivity The big example (obviously) of this type of hypersensitivity is allergy. Pollen, cat dander, peanuts â they all have the same mechanism and this is it. Type II (antibody-mediated) hypersensitivity There are a ton of diseases that have an underlying type II hypersensitivity reaction going on. Hereâs a partial list: 1.