Several factors can cause early periods, or mid-cycle bleeding, including excessive weight loss, ovarian cysts and pelvic inflammatory disease, according to Mayo Clinic. Irregular cycles can also indicate non-cancerous growths in the uterus. It is always best for females with menstrual irregularities to consult with a physician.
Birth control pills and certain medications may also cause more frequent or irregular menstrual periods, according to WebMD. Medical conditions such as diabetes and irritable bowel syndrome may also cause menstrual irregularities. Women who take illegal drugs or who have eating disorders, such as bulimia or anorexia, may experience erratic menstrual cycles or missed periods. Stress, travel and illness may also cause irregular menstrual periods.
Menopause is a natural condition in which the ovaries cease production of estrogen and typically occurs in women aged 45 or older, according to MedlinePlus. Menopause causes the menstrual cycle to stop, but women entering into menopause may experience changes in their menstrual cycles for several years before this occurs. Symptoms include frequent, light or irregular periods and heavy bleeding. Additional signs of menopause include mood fluctuations, concentration difficulties, night sweats and vaginal dryness. Because women may be at greater risk for osteoporosis and other conditions during menopause, it is best to consult with a doctor about how best to manage this natural event.