Brown-colored vomit may indicate that a person is vomiting blood, according to Mayo Clinic. Vomiting blood can result from minor conditions, such as nose bleeds or a cut in the mouth, to major conditions, such as stomach ulcers, gastritis and pancreatic cancer, states Healthline.
If an individual is vomiting blood and experiences side effects such as dizziness, blurred vision, cold skin, changes in her heartbeat or breathing, or severe abdominal pain, it is important to seek emergency medical attention, according to Healthline. If a person does not have a ride to the emergency room, then she should call 911. Additional, less severe side effects that may accompany vomiting blood include nausea and abdominal discomfort.