Multiple sclerosis is a neurological disease that occurs due to the autoimmune destruction of the protective covering over the nerve fibres in the brain and the spinal cord. The disease can be managed with medicines.
Pernicious anaemia is the decrease in red blood cells due to the inability of the body to absorb vitamin B12. The lack of vitamin B12 can be due to dietary deficiency of the vitamin or due to decreased absorption of the vitamin from the gastrointestinal tract. In pernicious anaemia, impaired absorption is due to the lack of Intrinsic Factor (IF).