Violets have been used medicinally for centuries.  There is some speculation as to whether Violets and their extracts are useful in cancers and tumors, and an experiment done in 1960 allegedly resulted in a Violet extract damaging tumors in mice.  Another story has it that a man with colon cancer was cured by eating Violet leaves, but apparently he had to eat a 1,600 square foot nursery bed of them to get this effect.  

The leaves and flowers of Violets do have expectorant properties, and work well in cases of respiratory disorders such as bronchitis, colds, and coughs.  One recipe calls for 1 tablespoon of Oil in a cup of water to be sipped slowly four times a day.  Alternatively, making a Tea to use as a gargle, or making a syrup by adding honey to thicken the tea are also valid ways to use this plant to combat these symptoms.  Ingesting a tea made of violet leaves is reportedly also effective as a laxative and for insomnia, and there are reports in the literature that Violets contain an aspirin-like substance that in a tea may be helpful in reducing the symptoms of hangovers.  This aspirin-like effect has also been reported as being effective externally in reducing headache and neck pain.  Pound the leaves into a paste, adding water and oatmeal as needed, then apply to a warm compress and place on the back of the neck.  This also works for the pain of rheumatism when applied to the affected area. Capsules can be made for internal use by pulverizing the leaves and making a powder.  Please see the link below for detailed instructions.

Violets have antiseptic properties that may be helpful in relieving symptoms of various skin eruptions and sores when made into an Ointment and applied as needed. 

Although it is reported that  ingesting large quantities of Violet seed may cause vomiting, these plants are safe, and as such are a good plant for the inexperienced herbalist to use for experimentation.