A new study ranks asthma, vision problems, and mental issues as the top three reasons many city children have trouble in school.
A study done by the Children's Health Fund study and the principals union also finds hunger and fatigue are also serious "barriers to learning."
The Crisis in the Classroom study focused on how children's health can affect how well students perform in school.
It also broke the research down by socio-economic lines.
Principals and assistant Principals working in elementary and middle schools were surveyed.
Results show administrators working the city's poorest neighborhoods report more health problems than those working in areas where fewer children qualify for free or reduced lunch programs.
Principals in higher poverty schools say they mostly need help from organizations that can provide health services at school, resources to promote family involvement, and access to mental health services at school.
For more information on the studies, visit childrenshealthfund.org.