Nutrient phase syndrome refers to the syndrome due to internal transmission of pathogenic febrile factors, consumption of nutrient yin and disturbance of the mind. This syndrome appears at the serious stage of epidemic febrile disease.
 
Clinical manifestations:
Severe fever in the night, mild thirst, vexation and insomnia, or even delirium, appearance of macules and eruption, deep-red tongue with scanty fur and thin and rapid pulse.
 
Analysis of the symptoms:
Severe fever?in the night is due to invasion of pathogenic febrile factors into nutrient phase and scorching nutrient yin; vexation and insomnia, or even delirium are due to invasion of pathogenic heat into nutrient phase and disturbing the mind; mild thirst is due to pathogenic heat steaming nutrient yin to rise up; appearance of macules and eruption are due to heat invading blood collaterals; deep-red tongue with scanty fur and thin and rapid pulse are the signs of heat scorching yin.