Here are some things that I have learned that may help others, regarding spearmint.
Spearmint leaves make a nice flavorful medicinal tea. It has a milder and cooler flavor than peppermint. (though peppermint is great too.) Just as with peppermint tea, spearmint tea has been known to be a popular herbal remedy for relieving indigestion and heartburn. It can soothe and upset stomach.
It is also has been said that tea can help congestion and coughing. You can even add spearmint leaves to bathwater to relieve congestion and to provide a relaxing soak for your muscles.
Please, never substitute anything you find here or elsewhere, for a doctors regular care. Your health is important..please rely first on a doctors care.)