My 20 yr. old daughter had black diarrhea today.She has a very sensitive digestive system and felt real sick from some Mexican food she had last night. She also vomited twice this morning. (Has a history of problems with things like salad dressings, sauces and most Mexican food. Still indulges in it unfortunately. Her father and grandmother also have lots of digestive problems. (This probably has no relevance but she's rather petite.) My question is: What causes black diarrhea?
She's a fairly healthy girl overall, but has also had some other unrelated health problems in the past 6-8 mos. Saw a GP for dizzy spells, and blacking out and she's also suffered from migraines, with dizziness and strong nausea. The doctor attributed the dizzy spells to going long stretches without eating during classes.