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Much pain is due to the super-sensitivity of an area through hyperaemia, or increased blood supply, following concentrated attention.

An important diagnostic mark is thus furnished between purely conjunctival hyperaemia and what is called circumcorneal congestion, which is always an indication of more deep-seated vascular dilatation.

Acute catarrh of the stomach is associated with intense hyperaemia of its lining coats, with visible engorgement and swelling of the mucous membrane, and an excessive secretion of mucus.

Alcohol and alkaline and carbonated drinks must also be avoided in all nervous conditions that are combined with hyperaemia of the brain, as meningitis, apoplexia, tumors of the brain, etc., since they produce congestions.

Acute inflammatory diseases of the brain and its coverings are associated with cerebral hyperaemia or congestion.