Situation: women was taking iron supplements which contained 26mg of iron for 30days, after few days she end up them started another bottle from different brand which contains 106mg of iron. When she started with 106mg tables first pill she took in the evening, then repeated in the morning, after lunch started to vomit black coffee grounds. Complained about stomach pain in the morning, in the evening after vomiting had severe pain in right side of the neck, upper area of the stomach what made it hard to breathe, better felt lying on her back, couldn’t lay on the side. Anemia for 7 years, gastrointestinal problems (low acidity), gastroscopy last time few years ago, without wounds. Ferritin 4; hemoglobin 110. Question: can iron supplements make it vomit in black color like coffee grounds or in this case it’s more gastrointestinal bleeding?