Narod SA. Tamoxifen ChemopreventionâEnd of the Road?. JAMA Oncol. 2015;1(8):1033â1034. doi:10.1001/jamaoncol.2015.2247. Download citation file:
About Rare Diseases. A rare disease is defined by the European Union as one that affects less than 5 in 10,000 of the general population. There are between 6,000 and 8,000 known rare diseases. Around five new rare diseases are described in medical literature each week.
The offical US government definition of a rare disease is one that affects 200,000 people or less. The following causes of Tongue weakness appear in the population at a rate of less than 200,000 people per year in the USA: 1  Primary Lateral Sclerosis - tongue weakness.  more causes...Â».