What is disability?
Disability is an impairment of the mind or body that prevents a person to function in one of more major life activities.
This depends on what you mean by not "serious". A disability is a disability. Check the disability laws for the state you reside in to find out what the requirements are in order for one to collect disability insurance. If your disability prevents you from working or performing normally, then it is still serious.
Answer When someone has an acquired disability it means they have received the disability as a result of an accident such as a car accident. A physical injury of some kind has created their disability. A developmental disability is when there is a genetic problem of some sort that creates the disability rather than the person receiving a disability as a result of being injured.