The major immigration problem in Canada is inadmissibility. Inadmissibility immigration in Canada means a person is prohibited from entering the nation due to some listed reasons. There are  different causes for inadmissibility, basically dealing with medical issues or criminal history.

It is important to mention that inadmissibility for immigration  applies to all applicants included in the application to Canada. For certain, if a family member is accompanying you to Canada or is included in an application for a visa, the entire application and all family included will be prohibited if there are criminal records or medical inadmissibility issues.

When an individual has been deemed inadmissible, that person is restricted from entering Canada, without special permission. Canadian immigration law states 9 categories under which someone can be deemed inadmissible to Canada.  Any applicant may have an application rejected for reasons such as health problems or a criminal record, which falls under the category of inadmissibility. For people in this category, it can be a big problem, especially if they want to visit relatives. 

Luckily, they can apply for a Temporary Residence Permit, which will allow them into the country, although the permit is not a path to permanent residency.