my girl friend is not going on period for 4 month

Hi Anon, Thank you for sharing your question with the EmpowHER community.

The absence of periods is called Amenorrhea.  There are two types:  Primary Amenorrhea and Secondary Amenorrhea.  Primary is when a young woman hasn't had her period by the age of 16.  Secondary Amenorrhea is when a woman who has been having a normal menstrual, stops getting her period for three or more months.

Amenorrhea is caused by changes in the organs, glands and hormones involved in menstruation.  Cause include:

• Stopping the use of birth control
• Some birth control methods (Depo-Provera)
• Stress
• Thyroid Issue
• Depression
• Over exercising
• Ongoing illness
• Pregnancy

Here are some additional resources for you and your girlfriend to review:

No Cycle or Missed Cycle:  What Could it Mean?

Amenorrhea:  Natural Methods May Restore Menstrual Cycle

I hope this helps.

Be well,

~Gillette