Mint or Chamomile Tea is a folk remedy for stomach ache:

“We use mint or chamomile for stomach ache. Those are the two popular things. Some people add a little bit sugar to make it taste better. But some people like the tea without sugar because they say it’s a medicine it shouldn’t have sugar.”

Sugarless mint tea and sugarless chamomile tea is a folk remedy my informant learned at a young age in León, Guanajuato, México. It makes sense that folk remedy would be used considering the difficulty buying medicine in the impoverished conditions my informant grew up in.