Hair shedding is completely normal.
For those who have gone through scalp cooling it can be difficult to remember what normal shedding looks like. A healthy person will on average lose around 100 hairs a day as part of the normal hir growth cycle.
The normal shedding cycle will continue through scalp cooling, with additional shedding as a result of the impact of the chemotherapy drugs.
Everyone should expect a level of shedding during scalp cooling. For most people this will start between 14 and 21 days after their first treatment, which would be when total hair loss would begin if you weren't scalp cooling. Scalp cooling will protect your follicles and will minimize hair loss, but it can’t save every hair. Shedding will be present at some level throughout treatment and for a period of time afterwards. It is usually heaviest during the first couple of treatments and for many people it then slows.