The passage of excessively dry or small amounts of stools (<50 ml/day) or infrequent stools (less often than normal).
Patients <50yrs old do not require investigation.
1. Impaired rectal emptying
Stools present in rectum by PR
1. Segmental disturbance in defecation reflex
- Poor habits
- Toilet training
- Laxative abuse / psychological.
1. Impaired rectal filling
Absent stools in rectum by PR
1. Systemic cause
3. Slow transit time
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