Thanks for the query. One month of hair fall usually relates to an acute cause or sometimes the beginning of a chronic cause. Did you have an illness in preceding few months like a typhoid, malaria or did you undergo a surgery? Are there any acute stressors, any unusual problems? If there are so, you may be having a condition called telogen effluvium, and usually settles in few months time even without any treatment. You should have a healthy diet and good sleep.
Further information is in the following weblink https://www.aad.org/public/diseases/hair-and-scalp-problems/hair-loss