The World Health Organization recognizes 55 medical conditions that are effectively treated using acupuncture including: hay fever, depression, headaches, knee pain, low back pain, morning sickness, rheumatoid arthritis, sciatica, sprains, strokes, and tennis elbow. A recent study in the Archives of Internal Medicine concluded that individuals with back pain that were treated with acupuncture had lasting relief in contrast to patients receiving medications and other medical treatments.