Is it bad that i havent had my period in nearly 4 months? they went from being painful/long/heavy, to almost no pain/short/light, to nothing.

Some thoughts...: In a woman with regular periods, some causes of a late period include: pregnancy, excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (like birth control pills), hormonal imbalances, etc… Seeing a doctor is a good idea if symptoms are persistent, recurring, or worrisome. If three periods have been missed, one's doctor can evaluate.