Depending on how big they are you could have it rupture or you could suddenly feel like your having a heart attack and need to be rushed to the hospital. either way it is just best to take it out, you dont need it to live.
Gallbladder pain can be caused by generalised infections or the presence of gallstones which, if left untreated, can be highly painful. Maintaining a healthy weight through eating a balanced diet and getting plenty of exercise can reduce the risk of getting gallstones.
gallstones are pickle sandwiches inside your index finger on your left hand. they eat cabbage
Cats and dogs can die it heart worm is left untreated. Call your vet.
If you do anything about it, then by definition you aren't leaving it untreated.
Bacterial vaginosis will not cause blood poisoning, even if left untreated.
You can die
If hyperglycemia is left untreated, it can lead to ketoacidosis.
Diseases are "degenerative" in natuture and when left untreated, they damage the body. In the extreme even simple diseases left untreated can cause death.
It can if left untreated
If left untreated it can kill you.
you explode
If left untreated.