Symptom Guide

Symptom Guide

Allergic reactions can affect different areas of the body but are most likely to appear on the skin, in the tummy area and the respiratory tract. Please browse the symptom guide if you are looking for detailed explanations and pictures to each condition possibly caused by food allergy.

Symptom Guide » Gut » Blood in stool

Blood in stool


Bloody stools often indicate a disorder or injury in the digestive tract.

Your doctor may use the term "melena" to describe black, tarry, and foul-smelling stools or "hematochezia" to describe red- or maroon-coloured stools. Blood in the stool may come from anywhere along the digestive tract, from mouth to anus. It may be present in such small amounts that you cannot actually see it, but is only detectable by a faecal occult blood test.

A black stool usually means that the blood is coming from the upper part of the gastrointestinal tract. This includes the oesophagus, stomach, and the first part of the small intestine. Blood will typically look like tar after it has been exposed to the body's digestive juices. Maroon-coloured stools or bright red blood usually suggests that the blood is coming from the lower part of the gastrointestinal tract (large bowel, rectum, or anus). Consuming black liquorice, lead, iron pills, bismuth medicines like Pepto-Bismol, or blueberries can also cause black stools in your breast-fed infant. Beets and tomatoes can sometimes make stools appear reddish.

In children, the most common causes for blood in the stool are constipation and food allergies. Advise your doctor if you notice blood in your child’s stool.

Sources: 1,2


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