The American Psychological Association has released several guides for psychologists who work with people belonging to certain groups — members of ethnic and linguistic minorities, for example, or women and girls.

It did not have a guide for working with males, in part because they were historically considered the norm. But in August, the A.P.A. approved its first set of official guidelines for working with boys and men.

The guidelines, 10 in all, posit that males who are socialized to conform to “traditional masculinity ideology” are often negatively affected in terms of mental and physical health.

They acknowledge that ideas about masculinity vary across cultures, age groups and ethnicities. But they point to common themes like “anti-femininity, achievement, eschewal of the appearance of weakness, and adventure, risk, and violence.”