<s>[INST] Could you tell me if iron supplements can cause black vomiting in an anemic seventy four year old woman? she has had a colonoscopy and a gastroscopy and all seemed fine! Small polip was removed but not cancer. Because of iron deficiency she was put on iron tablets. She hardly eats and has lost a lot of weight. [/INST] Hi, dairy have gone through your question. I can understand your concern. Iron supplement does not cause black vomiting. She may have some bleeding in your GI tract. She may have varietal bleeding. She should for ultrasound abdomen. Consult your doctor and take treatment accordingly.  Hope I have answered your question, if you have any doubts then contact me at bit.ly/ Chat Doctor. Thanks for using Chat Doctor. Wish you a very good health. </s>