A baby bird gets fed by it's mother right? She regurgitates what she ate and spits it into the baby's mouth. Now, imagine a human doing that. Gross. However this is a (rare) eating disorder. It's called rumination.
Eating disorders are all about control over food. With a lot of them, you throw up. From a binge or other factors. Rumination disorder is kind of like that. Healthline says that it is the regurgitation of food after meals, usually after a bit of time. The food can be spit out, re-chewed, or re-ingested.
The problem with our healthcare is that we study the big things. All the focus is there. Eating disorders, which effect millions, don't get research or attention. And rumination, is very small. It's really rare but also chronic and can effect anyone. You know what that means? It means that there is not much known about it. The cause is unknown. Diagnosis testing? Don't have that. Medication. None.
There is treatment for it. It's all in changing learned behaviors. Changing the breathing and digesting patterns of a person to keep the food down. The food that does come back up is what causes the damage to the body. It dries out lips, strips away enamel off of
teeth, and bad breath. As well as when the food is re-swallowed, it hurts the interior of the stomach.
The people that do tend to get it are infants and children. People will intellectual disabilities are also more prone to it, but do need immediate clinical care.
Mental health issues are often ignored in today's society. Especially non-view able ones. But people do suffer from issues like rumination that can cause drastic problems to their health. More attention needs to be paid to those that struggle, and give them the help they need.