Bleeding after straining to have a bowel movement can be caused by an episode of constipation. It is important to address the underlying cause of constipation and increase fiber intake through fruits and vegetables, whole grains, and enriched cereals. Drinking plenty of fluids can also help soften the stool. If straining continues, it is recommended to consult with a pharmacist for over-the-counter options. Additionally, it is best to avoid sitting on the toilet for extended periods of time to prevent worsening the situation.