Haemorrhoids: pathology, pathophysiology and aetiology

Haemorrhoidal disease remains poorly understood despite its clinical prevalence. While anal cushions are known to support continence, their displacement leads to disease. Blaming constipation or bowel habits lacks strong evidence. A key finding is elevated resting anal pressure, but its role is unclear. Researchers have not yet determined if this pressure is a cause or a consequence. The longitudinal muscle's role in the condition remains unexplored. Subepithelial muscle pharmacology is also unstudied. These gaps limit treatment development.

This review aims to clarify the mechanisms behind haemorrhoidal disease. It focuses on the displacement of anal cushions and their physiological consequences. The study highlights the lack of evidence linking bowel habits to disease. It investigates elevated anal pressure as a potential secondary effect. The purpose includes identifying unexplored areas like muscle function. Researchers also aim to assess pharmacological responses in anal tissues. The review seeks to guide future investigations into treatment options. It emphasizes the need for targeted physiological studies.

The review synthesizes existing literature on haemorrhoidal disease pathology. It examines the role of anal cushions in continence and their displacement. The authors analyze evidence regarding bowel habits and disease causation. They assess physiological data on resting anal pressure. The review includes studies on longitudinal muscle function. It also considers subepithelial muscle pharmacology. Researchers evaluate the clinical potential of pharmacological agents. The approach combines clinical and physiological findings.

The primary finding is that anal cushion displacement causes haemorrhoidal disease. Bowel habits are not strongly linked to disease onset. Elevated resting anal pressure is a consistent physiological abnormality. However, this pressure likely results from disease rather than causes it. The longitudinal muscle's role remains unclear. Subepithelial muscle pharmacology is understudied. Specific pharmacological agents may reverse observed changes. These findings suggest new research directions for treatment development.

The authors conclude that haemorrhoidal disease stems from anal cushion displacement. Bowel habits are not primary causes, despite common assumptions. Elevated resting anal pressure is a secondary effect. The role of longitudinal and subepithelial muscles requires further study. Pharmacological agents may offer therapeutic potential. The review highlights gaps in understanding disease mechanisms. Future research should focus on muscle function and drug responsiveness. These conclusions emphasize the need for targeted physiological investigations.