You are suffering from hormonal changes causing Androgenetic alopecia causing hair fall. It's completely stoppable even regrowth of hair is possible with certain medications without any side effects. Treatment depends on the grade of hair loss. So, it's a must for diagnosing which grade, you are in for an effective treatment. Please  send more photos of your head, by direct online consultation for accurate diagnosis and proper treatment.

Hello We need to ask detailed history about hairfall ,examine hairs once In the picture ,it is looking like male pattern baldness or androgenetic alopecia ,it is due to many reasons like genetics,hormones ,heredity,strees,vitamin deficiency It can be prevented and further hair loss can be avoided by appropriate medicines