Blood in stool is a symptom that should not be explained away automatically as hemorrhoids. A small bright red streak after hard stool often comes from irritation around the anus or from a fissure, but repeated bleeding, blood mixed into the stool and black tar-like stool always need attention.
The first useful clue is the colour of the blood and where it appears.
Bright red blood on paper or on the stool surface#
Bright red blood on wiping or on the surface of the stool often fits an anal fissure or hemorrhoids. A fissure usually causes sharp pain during and just after bowel movements. Hemorrhoids may cause pressure, itch, burning or a lump sensation.
Even if the symptom seems to fit irritation, repeated bleeding is not something to follow for long on your own.
Dark stool and black stool#
Black, tar-like and unusually bad-smelling stool may point to bleeding from higher up in the digestive tract. At home it is not always easy to tell the difference, because food and iron products can also darken stool.
If weakness, dizziness, paleness, abdominal pain, vomiting or a pounding heart comes with it, seek care quickly.
What bowel changes tell you#
Blood in stool matters more when bowel habits have changed too. New constipation, long diarrhoea, a feeling of incomplete emptying or a clear narrowing of the stool all change the picture.
If bleeding comes with abdominal pain, fever, weight loss or unusual fatigue, do not watch it at home for too long.
What to do if it seems to be anal irritation#
If the blood is small, bright and linked to hard stool, the first goal is to reduce straining. Enough fluids, more fibre gradually, regular meals and unhurried toilet visits can soften bowel function.
The skin around the anus should be washed gently and dried without rubbing. Strong cleansers, fragrance and long sitting on the toilet can worsen irritation.
When to seek care#
Seek urgent care if the stool is black and tar-like, if blood comes in large amounts, if the blood looks mixed into the stool, if you feel weak or faint, if the abdomen is very painful or if vomit contains blood.
Seek care also if blood in stool keeps returning, even if the amount is small. Assessment is especially important if bowel habits change, weight falls, fatigue suggests anaemia or abdominal pain is present.
Further reading and sources#
Further reading: