The Chinese had little to go on when devising their ideas of internal anatomy and organ function, and so based many of their medical hypotheses on observation and refined the ideas over a couple of thousand years.
The body can be seen as a kind of "black box" in which various inter-related functions take place. Now, these functions mainly concern the assimilation of Qi energy from an external source, such as food and air, and convert the vital part of these into a form of energy that can be used for metabolic processes. If you think of a central heating boiler, it has to convert air and fuel into heat, and then circulate that heat to the house. The Chinese organ system works is a similar way; the Lungs extract Qi from air, the Heart combines it with Blood and circulates it; the fuel comes from the food we eat, and this is the role of the Spleen.
When we take in food, the Stomach has to heat it till the useful Qi separates from the less useful "dregs"; as this is a heating process, the Chinese view very cold foods and drink as pathogenic, slowing down digestion and leading to problems. Now, once the food is up to temperature, it's considered that the Spleen is the Organ that separates the useful Qi and transports it to the Heart where it combines with Air Qi to form Blood.
So, if the function of the Spleen is diminished, the muscles are not nourished by Blood, leading to poor muscle tone and general flabbiness. The Spleen is attributed with a "holding" function, in that it "lifts" the Organs, keeping them in their natural place; in addition it keeps Blood in the Vessels.
The upshot is that if the Spleen function is diminished, there might be things like a pale, flabby tongue, pale because Spleen fails to engender Blood, and flabby as the muscle are not nourished. In addition, there might be loose stools, as failure to fully transform food leads to excessive fluid in the body. There may be a sense of heaviness in the arms and legs as the muscles are easily tired. One may be easily bruised, as the Spleen fails to "hold" Blood in the Vessels. There may well be a desire for sweet foods, as the body is looking for an energy hit, as the foodstuffs are failing to nourish the tissues. There may be excessive sleepiness after eating, as the digestion is weakened, and diverts energy from elsewhere.
The prolapse then, stems from this weakened function. Poor assimilation of food fails to nourish the muscles, which loose tone and fail to hold the Organs in place. So then, what weakens digestion?OverthinkingExcessive worryingFailure to recover energy after childbirthCold foods and drinks, especially when mixed with warming foodsDairy foodsBloodloss
There, I hope that helps. The students at the university where I teach get a bit puzzled between Eastern and Western ideas of the body, and the difference between form and function, but there is a fuzzy logic to these ideas based in observation of very real people and situations.
My Chinese sifu used to say - "western medicine is based on DEAD bodied, ours is based on living ones!"