Hello
If nothing has changed in the areas most responsible for your hair loss then I suggest you see a doctor and have a blood test done to confirm that everything is ok. Sometimes our bodies have a timer thats responsible for certain things happening, that to us may seem strange or out of the ordinary when in fact its pretty normal.
Go see your gp and have it checked out if you feel it to be serious and if nothing in your diet, lifestyle or your stress levels have changed.