Dark Stool
In some cases, heartburn might cause bleeding in your intestines and cause your stool to turn black or even red. This is probably because the acid from this issue triggers severe straining and cramping, which leads to blood your feces. Just like bloating, dark or bloody can be caused by a variety of health issues, such as cancer, anal fissure, ischemic colitis, and more. Since some of these conditions could be complicated and severe, it is necessary to see a doctor and get early detection and treatment. [2]
