Abnormal breath from the oral cavity and nasal cavity can often be detected directly, while abnormal breath from the gastrointestinal cavity often has clinical signs of indigestion. Abnormal breath from the bronchus and lungs is often accompanied by cough, large amount of foul sputum, chills, fever, chest pain on the affected side, shortness of breath, excessive sweating, general weakness, lack of appetite, etc. Physical examination of the affected side of the lung percussion turbid sounds, lung solid signs, chronic patients often have disobedient fingers (toes), diabetic acidosis patients exhale acetone breath like the smell of rotten apples. Slightly sweet, often with symptoms of polyphagia, polydipsia, polyuria and wasting; uremic patients exhale with the breath of urine and renal disorders manifest edema, anemia, hypertension and changes in urine and renal function. In advanced cirrhosis, there are signs of portal hypertension and a specific liver odor when liver function is declining. In the case of purulent inflammation of the lungs, the total number of blood cells increases to (20-30)X10/L neutrophils above 0.90, the nucleus is obviously left shifted, there are often toxic particles, the sputum is purulent and yellow-green, and the bacterial examination of the sputum can be found to cause bacteria. In cirrhosis, the liver function is impaired, the aminotransferase (ALT) is significantly increased, IgG, IGA, LGM can be increased, etc. In uremia, there is a decrease in red egg, platelet count, proteinuria, tubular urine, abnormal renal function, increased ammonia and plasma creatinine, and increased uric acid. In diabetic acidosis, urine ketone body is strongly positive, blood glucose level is increased, blood ketone body is increased, carbon dioxide binding capacity is reduced, and negative alkali residual value is increased. X-ray examination of pulmonary abscess shows a large dense and faint infiltrative shadow with indistinct edges, or a dense shadow in the form of a mass, distributed in one or several lung segments, with round translucent areas and fluid planes in the abscess cavity, surrounded by a dense inflammatory infiltrate, fiberoptic bronchoscopy can directly detect the presence of foreign body obstruction, drainage of bronchi, and brush and biopsy can be done to obtain relevant bacteriological and cytological evidence, and sputum can also be aspirated to help It can also aspirate sputum to help drain the abscess and play a therapeutic role. In the case of portal hypertension, the diameter of portal vein and splenic vein is widened, and in the case of ascites, a dark area of fluid is found. Barium swallow x-ray of esophagus, the x-ray of esophageal vein curve shows worm-like or earthworm-like filling defect, widening of longitudinal mucosal wrinkles, and daisy-like filling defect of gastric fundic varices. Gastroscopy, radionuclide, liver aspiration biopsy, abdominal ytterbium examination, etc. can find the corresponding lesions.