Here is an amazing fact about human body: On average, menstrual cycle is 28 days, from the first day of menstruation to the first day of next cycle. But the menstrual period of those women who are close friends or live closely together, for example in a dorm, gradually synchronizes (occurs at the same time).
While there is some debate over “menstrual synchrony”, but Pheromones (Airborne chemical signals) and sense of smell are believe to be responsible for this interesting phenomenon.

Cannabis
Cannabis Patch That Heals Fibromyalgia and Diabetic Nerve Pain
A company that has closely monitored the health benefits of cannabis has designed an effective cannabis patch that alleviates diabetic nerve pain and fibromyalgia symptoms.