If you mean getting a menstrual period, it usually starts naturally during puberty
Eat enough food and maintain a healthy body weight
Reduce extreme exercise if you are overtraining
Manage stress and get enough sleep
Track your cycle if your periods are irregular
See a doctor if you have not started periods by age 15 or within 3 years of breast development
See a doctor if periods stop for 3 months or more after they have started
Get medical help right away if you have severe pain, very heavy bleeding, or possible pregnancy