I just started chemotherapy last week and went with the cold cap option. So much to tell you about it so I hope it makes sense. You need to wear the cap for at least 30 minutes before commencing chemotherapy and then continue wearing it throughout the treatment AND at least 1.5 hours after treatment is complete. I've attached a photo of what it looks like. I'm hooked up to a machine but I'm aware of other cold caps which aren't hooked up to a machine. Instead, the other version of the cold caps requires you to replace your cold cap every 20-30 mins before they warm up. I've heard that some nurses won't do this for you because it's too much of a burden so if you have access to cold caps hooked up to a machine like mine is then take it.
I heard that they are sometimes painful but it wasn't for me and I'm the type that hates the cold conditions. I would suggest that you try it without the numbing cream at first. I couldn't feel it on my head after the first 20 minutes and I had to wear the cap for between 4-4.5 hours in total. Are you aware of all the conditions associated with the cap? That is, you can't wash your hair in hot water, no blow drying, no hot irons, no colouring, no washing more than twice a week. I use Nioxin shampoo, treatment and conditioner because it was recommended to use when having the cold caps.
I would definitely recommend trying it. Good luck and take care, Teresa xxx
PS I haven't heard anything about painting your nails black but I might give it a go myself and see what happens.
