Slight blood in vomit: what to know

Even a small amount of blood in vomit should be medically assessed because bleeding can worsen or signal an upper digestive tract problem. Blood may look bright red, dark, or like coffee grounds. It can follow forceful vomiting, a nosebleed, irritation, an ulcer, medicine-related injury, or bleeding from the oesophagus or stomach. The appearance alone cannot identify the cause.

Repeated retching can irritate or tear small vessels near the junction of the oesophagus and stomach. Other causes include inflammation, ulcers, enlarged veins, or a tumour. Oesophageal cancer and stomach cancer can present with upper digestive bleeding, but blood in vomit does not by itself establish either diagnosis. Tell the clinician about abdominal pain, black stools, weight change, swallowing difficulty, alcohol use, and medicines such as aspirin or blood thinners.

Arrange prompt medical assessment, even if the bleeding has stopped. Do not drink alcohol or take extra aspirin or anti-inflammatory medicine unless a clinician directs you. Keep a note of the colour and approximate amount, whether vomiting continues, and any medicines taken. If possible, bring the medication list and do not drive if dizzy or weak.

Call emergency services for ongoing or large-volume bleeding, coffee-ground vomit with weakness, fainting, confusion, rapid breathing, severe abdominal or chest pain, pale clammy skin, or black tarry stools. Emergency assessment is also needed if you cannot keep fluids down or take blood-thinning medicine. These signs can indicate significant blood loss or a serious upper digestive tract problem.

Ask where the bleeding may have started, whether blood tests or an endoscopy are needed, which medicines to pause or continue, and what symptoms should send you straight to emergency care.