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In page Anemia:

"
  • Gastrointestinal tract lesions,[1] causing either acute bleeds (e.g. variceal lesions, peptic ulcers, hemorrhoids[2]) or chronic blood loss (e.g. angiodysplasia)
  • Gynecologic disturbances,[1] also generally causing chronic blood loss[citation needed]
  • From menstruation, mostly among young women or older women who have fibroids[citation needed]