From ESTA - the Official U.S. Government Web Site to help you decide what your answer should be read and work through the following:
Physical or Mental Disorders
With regard to physical or mental disorders, answer ”Yes” to this question if:
(a) You currently have a physical or mental disorder and a history of behavior associated with the disorder that may pose or has posed a threat to your property, safety or welfare or that of others; or
(b) You had a physical or mental disorder and a history of behavior associated with the disorder that has posed a threat to your property, safety or welfare or that of others and the behavior is likely to recur or lead to other harmful behavior.
Answer ”No” if:
(a) You currently have no physical or mental disorders; or
(b) You have or had a physical or mental disorder without associated behavior that may pose or has posed a threat to your property, safety or welfare of that of others; or
(c) You currently have a physical or mental disorder with associated behavior, but that behavior has not posed, does not currently pose nor will pose a threat to your property, safety or welfare or that of others; or
(d) You had a physical or mental disorder with associated behavior that posed a threat to your property, safety or welfare or that of others, but that behavior is unlikely to recur.
This information is from the websites HELP section. Here is a link.
https://esta.cbp.dhs.gov/esta/WebHelp/E ... 1.htm#What information do I need to complete the application?