 [ Symptoms ] should i be concerned that my child will receive the tetanus vaccine twice in less than a year  my 14 yr old son received a tetanus vaccine in june 2014 from our family doctor due to a foot injury in january 2015 my son and his fellow grade 9 students are scheduled to receive the dtap vaccine should i be concerned that he will receive the tetanus vaccine twice in less than a year [ Disease ] severe nutritional deficiencies are typically associated with crohn is disease which affects the small intestine where most nutrients are absorbed because ulcerative colitis affects the large intestine it can cause severe and sometimes bloody diarrhea putting patients at risk for iron deficiency and anemia you can measure your iron level with a simple blood test ulcerative colitis can also deplete stores of folate that is especially dangerous for women of child bearing age since folate deficiency is linked to birth defects fluid loss from diarrhea can also cause electrolyte imbalances