Hello. Thank you for writing to us You seem to have telogen effluvium. Underlying thyroid is one of the causes of telogen shedding. Once the underlying cause is corrected hair fall would still take 1-3 months to recover. This is because hairs that are already in telogen phase will shed over the next 1-3 months and only then these hair follicles would re-enter growth phase (anagen) and start producing new hair. Minoxidil helps in faster transition from telogen to anagen. This may in fact manifest as further increased hair shedding once patient starts using minoxidil because of anagen hair that is growing that pushes out telogen hair and may manifest as increased hair fall. This increased shedding in response to minoxidil is known as anagen surge. This reaction to minoxidil is actually quite welcome because telogen hair that were going to be shed over a longer period of time are shed faster due to anagen hair growing and pushing telogen hair out. Therefore I suggest you to continue with the treatment for thyroid as well as topical minoxidil and hopefully your hair fall will recover soon. Regards