Late or absent menstrual periods can be caused by pregnancy, stress, travel and drug use, according to WebMD. Birth control pills and medical conditions such as polycystic ovary syndrome can also cause missed or irregular menstrual periods.
Missed or late periods are sometimes caused by allergy medications, antipsychotic drugs and blood pressure pills, according to Mayo Clinic. In certain cases, late or absent menstrual periods occur due to natural reasons such as breast-feeding or menopause. Women with missed periods due to underlying illness or hormonal factors may also experience symptoms such as facial hair growth, vision disturbances and headaches.
It is important for females to consult with a physician if they miss three or more menstrual periods in a row, according to Healthline. Missed or absent menstrual periods are also referred to as amenorrhea. Treatment for amenorrhea depends on the underlying cause of the condition. Diagnostic tests used to detect the cause of amenorrhea include urine tests, blood tests, pregnancy tests and pelvic exams. The condition is treatable with medication, surgical procedures and emotional therapy. If amenorrhea is caused by rapid weight loss or weight gain, females can often regulate their menstrual cycles by changing their diets and implementing healthy exercise plans.