Planktonia is a Chinese medicine term, in which plankton means not being able to get through, full means fullness and distension, so planktonia means fullness and distension and not being able to get through, and natriuresis is eating less, so planktonia means that the stomach is distended and not able to eat, and it can also be expressed in terms of loss of appetite, natriuresis, and so on. From the perspective of traditional Chinese medicine, this condition is usually caused by deficiency of spleen and stomach qi or stagnation of spleen and stomach qi, which may be caused by cold and dampness, dampness and heat, stagnation of qi, stagnation of blood, etc. It may also be caused by the blockage of the spleen and stomach by these pathological factors, which may lead to a further decline of the function of the spleen and stomach after a long period of time, and result in the occurrence of deficiency of spleen and stomach qi, deficiency of spleen and stomach yang, or insufficiency of stomach yin, or deficiency of spleen and kidney yang. From the perspective of Chinese and Western medicine, it may be caused by acute and chronic gastritis, reflux esophagitis, gastric ulcer, duodenal bulb ulcer, etc. Therefore, it is recommended to check gastroenteroscopy for further diagnosis.