... . Bilberry grows in North America, Europe, and northern Asia. What It Is Used For:Historically, bilberry fruit was used to treat diarrhea ... , scurvy, and other conditions.Today, the fruit is used to treat diarrhea, menstrual cramps, eye problems, varicose veins ... tion in which the veins do not efficiently return blood from the legs to the heart), and other circulatory problems.·Bilberry ...