Refers to toxic Heat generated by bacterial or viral infection. Refers to the depth of the disease. Interior syndromes are mostly severe or chronic and deep. In interior diseases the pathogenic factors are on the interior of the body and attack the organs. Tongue is scarlet red on tip and sides, with yellow coating.
Pulse is wiry and rapid.
Marked by mental irritability, bitter taste in mouth, thirst, etc. Similar to Fire but not as severe. Manifests in irritability, tendency to anger, dizziness, abdominal and hypochondriac pain and distension, fullness in chest, excessive sighing, breast distension, belching, loss of appetite, nausea, sensation of a foreign body in throat, menstrual disorders. Pulse is thready and taut. Tongue is reddened with little coating.