A mustard bath is a traditional therapeutic remedy for tired, stressed muscles, colds, fevers and seizures.
It was a standard medical practice up until the first part of the twentieth century and continues to be used in alternative medicine.
Baths in general have been historically used in medical practices for a variety of reasons, from stimulating the skin, to acting as a sedative, and also simply to clean.
[1] Mustard baths specifically were known for their ability to remove toxins from the body and providing a feeling of warmth to the skin.
[3] Mustard baths have been used to treat a variety of illnesses, ranging from acne to insanity, typically it was thought that the sensation of warmth brought on by mustard baths had a calming effect on the body and could calm a racing heart.