â¢ There are nearly 700,000 transgender individuals in the U.S., or 0.3% of the adult population. â¢ Of those who identify as transgender, a majority have taken some steps to transition from one gender to another. â¢ There are more than 8 million adults who identify as LGB in the U.S., or 3.5% of the adult population. â¢ An unknown number of transgender individuals also identity as LGB, so there is some overlap. â¢ Among adults who identify as LGB, bisexuals comprise a slight majority, 1.8% compared to 1.7% lesbian or gay.
Substances that cause an allergic reaction are called allergens. Reaction to allergens can cause your eyes to become red and irritated, prompting tear production, itching, and burning. The most common outdoor causes of allergic eye symptoms are grass, tree, and weed pollens.
In adults, blocked tear ducts, which cause tears to build up in the eyes, may be caused by one or more conditions. They include: 1  Thickening of the tear duct lining. 2  The tear ducts may become narrow due to thickening, swelling, or inflammation of their lining. 3  This is called primary acquired nasolacrimal duct obstruction (PANDO) and is most common in women over the age of 40.