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Acute inflammation is the initial physiological response to tissue damage, such as that caused by mechanical, thermal, electrical, irradiation, chemical, or infective insults. It can be acute (lasting for a few days) or chronic (in response to an ongoing and unresolved insult). Inflammation can develop into permanent tissue damage or fibrosis.
Different morphological types of acute inflammation include:
1. **Catarrhal inflammation:** A surface inflammation associated with greatly increased secretion of clear mucus. Later, polymorphs appear.
2. **Hemorrhagic inflammation:** Inflammation with bleeding.
3. **Suppuration:** Inflammation with pus formation.
4. **Serous inflammation:** Inflammation with fluid accumulation.
5. **Fibrinous inflammation:** Inflammation with fibrin deposition.
6. **Pseudomembranous inflammation:** Inflammation with a false membrane formation.
7. **Ulcer:** Inflammation with tissue loss.