People have been using willow bark for years to ease inflammation which is the cause of most aches and pains. The bark of the white willow contains the chemical salicin, which is similar to the main ingredient in aspirin. People would chew the bark itself to relieve pain and fever but now it is sold as a dried herb that you can brew like tea. It also comes as a liquid supplement or in capsule form. You can use willow bark to help relieve discomfort from back pain, headaches and much more.