A report published by not-for-profit organisation UK Trans Info has revealed that people with gender dysphoria in the North East could wait 12-years for treatment, based on current staffing levels and trends.
The report also revealed that no new patients were seen by the Northern Region Gender Dysphoria Service between February and April this year.
People with gender dysphoria do not identify with their biological sex, and may feel they were born with the wrong genitalia.
The long waits predicted have been caused by an increase in demand on services.
NHS England's target for the length of time between being referred by a GP and starting treatment is 18-weeks.
Some treatments can take up to 7-years to complete, so a patient referred by a GP today might not complete their treatment for another 19-years.