Can hair loss accelerate from time to time?

Genetic hair loss is not like a straight line if you plotted it out. You inherit a pattern and at different ages some hairs will undergo miniaturization and eventually fall out. So yes, hair loss can accelerate, then slow down and then accelerate again.  If you are treating it, you may be treating a stop and go process.  Many of my patients tell me that even when they take a drug like finasteride, they may start losing their hair in spirts and stops.