Bright red blood once when expelled gas. no blood in stool. stool normal brown color. have hemorrhoids. what else might cause this?

Need evaluation: Likely hemorrhoids. But better get the evaluation.

Several other: Possibilities can cause bright red blood. If you get an evaluation you will get a more accurate diagnosis.

Rectal Bleeding: It is almost always going to be hemorrhoids or a small tear known as an anal fissure. This is one of the most common problems that patients see their family doctor for.