White Willow pull Willow bark may be the bark after countless types of their willow tree, like white willow as European willow, black willow as pussy willow, split willow, purple willow, as well as others. Each bark is employed in order to make treatments. Willow bark acts nearly the same as aspirin, therefore it is used for pain, plus headache, strength problem, menstrual cramps, arthritis rheumatoid RA, osteoarthritis, gout, plus an ailment associated with the back named ankylosing spondylitis.