Abdominal pain is the most important and commonest alimentary symptom.
Mechanism of abdominal pain are the following
- Spasm or stretch of the smooth muscles of hollow viscus
- Ischemia of viscera - Spleen, intestine etc.
- Stretch of the capsule - Hepatic pain ,Stretch of Glisson's capsule
- Pain from parietal peritoneum - Inflammation, malignancy, irritation etc.
- Referred pain to abdomen
- Psychogenic - Depression, somatisation disorder
