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The internal diseases of TCM includes two categories: exogenous and endogenous diseases. The former is caused by six exogenous pathogenic factors, the latter is caused by seven abnormal emotional factors, improper diet, overstrain, disturbance of distribution of qi, blood, and fluids, and pathological product secondary to the disturbance. Although endogenous diseases are varied in types and complicated in pathological changes, their pathogenesis is always limited to the dysfunction fo zan-fu organs, disturbance in the production and distribution of qi, blood and body fluid, and dysfunction of meridian system. To descend to particulars, the lung controls qi and respiration; disorders such as cough and asthma caused by the impaired dispersion of lung qi and dysfunction of respiration belong to diseases of the lung. The heart dominates blood and vessels, and rules the spirit; disease such as arrhythmia, coronary heart disease and epilepsy are the result of disturbance of blood circulation and abnormality of emotional and mental activities, and belong to diseases of the heart. The spleen rules transportation and transformation, and the stomach functions in receiving and digesting food; the dysfunction of the spleen and stomach may lead to gastritis, enteritis and constipation. The liver is a resolute organ, being responsible for maintaining smooth circulation of qi and storing blood; the dysfunction of the liver and gallbladder in maintaining circulation of qi and blood may lead to diseases such as hepatitis, hepatocirrhosis and cholecystitis, And endogenous wind due to hyperactivity of liver yang may disturb the head and eyes and lead to dizziness and headache. The kidneys store essence, dominate development and reproduction, and control water metabolism; therefore diseases affecting urinary and reproductive systems such as impotence, spermatorrhea, nephritis and urinary infections can be ascribed to diseases of the kidneys. Diseases such as rheumatoid arthritis and gout are caused by invasion of pathogenic factors into the meridian system, and should be classified into diseases of the meridian system. By the five-zang-organ system as the key link, associating it with the systems of six-fu-organs, meridian, and qi, blood, and body fluids, endogenous diseases may be categorized into different patterns.
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