Common causes include:
- Low-fiber diet, particularly diets high in meat, milk, or cheese
- Dehydration
- Lack of exercise
- Delaying the impulse to have a bowel movement
- Travel or other changes in routine
- Certain medications, such as high calcium antacids and pain medications
- Pregnancy
- Fewer than three bowel movements a week
- Passing hard, dry stools
- Straining or pain during bowel movements
- A feeling of fullness, even after having a bowel movement
- Experiencing a rectal blockage
*Healthline https://www.healthline.com/health/constipation