Painless bright red blood in stool

"Blood in your stool typically means that you are bleeding from somewhere in your intestines," says Christian G.

Stevoff, MD,agastroenterologist at Northwestern Medicine.

Pictures of blood in stool

"This is why you should always contact your care team if you see blood of any shade — from bright red to almost black — in your stool."

Causes of Rectal Bleeding

• Hemorrhoids are a common cause of blood in your stool.

  Hemorrhoids are swollen veins that can develop both inside the rectum and in the skin around your anus. Hemorrhoids are not harmful, but they can cause bleeding when you're passing stool. They can be painful and irritating as well.

  Large amount of bright red blood in toilet no pain

• Ulcers, or sores, can develop on the walls of your intestines, causing pain and bleeding. Ulcers are more serious than hemorrhoids, as they can cause substantial internal bleeding.
• Gastrointestinal cancer can cause blood in your stool as well, including colorectal cancer, stomach cancer and esophageal cancer.

• Inflammatory bowel disease (IBD) is chronic inflammation of your gastrointestinal
  blood in human feces
  blood in the feces of a dog