Acute inflammation:

• It is an immediate and early response to injurious agents.

Aetiology:

• Infectious agents: These include bacteria, viruses, fungi, chlamydiae, rickettsia, mycoplasma, helminths, protozoa, and arthropods (insects).
• Chemical agents: These includes toxins, acids, alkalies and other caustic substances.
• Physical agents: These includes burns, trauma, electricity shock, radiation, excessive cold and heat.
• Immunologic reaction: Hypersensitivity reactions, autoimmune diseases
• Nutritional imbalances
• Necrotic tissue