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.
Hay fever facts. 1  Hay fever (allergic rhinitis) is a common allergic condition. 2  Symptoms of hay fever mimic those of chronic colds. 3  The best way to treat an allergy condition is to identify the allergic trigger and avoid it. 4  Histamine is a key chemical cause of allergic rhinitis and other allergic reactions.