Instructed patient Call 911 anytime you think you may need emergency care. For example, call if: You passed out (lost consciousness). You have signs of severe bleeding, such as: A severe headache that is different from past headaches. Vomiting blood or what looks like coffee grounds. Passing maroon or very bloody stools. Call your doctor or nurse call line now or seek immediate medical care if: You have unexpected bleeding, including: Blood in stools or black stools that look like tar. Blood in your urine. Bruises or blood spots under the skin. You feel dizzy or light-headed.