Chances are you won't lose your hair on FOLFOX, but might have a little thinning. There is a very tiny chance you'll be like me and lose a lot.
I had very, very thick long hair all my life. I lost about 9/10 of it on FOLFOX. But because of how thick it was to start, anyone that didn't know me wouldn't have noticed. They would just think I had rather thin hair. It did get to the point of being quite receded at the temples, and very thin on the front top and sides, so I kept the front parts pulled back into a ponytail, or kept all of it back in a ponytail or bun. This gave the illusion of still having my thicker long hair. But I only had a tiny wimpy ponytail when you looked in the back.
I stopped chemo the end of April, and a few months later it started filling in more. The new hair was a lot softer than my hair has been for years.
But I only had a few months off - my cancer was active again so I'm back on chemo since September. I'm on FOLFIRI w/Avastin, and my hair started falling out pretty more rapidly than before. It is common to thin a lot, or lose it on Irinotecan, so this was not unexpected, as it was with FOLFIRI. I cut it short, and really liked it. But I didn't get to keep it for long. I did the old man comb-over for a bit, but my hair got so thin and had so many bald spots that it looked awful. So we shaved. Both of my sons and my husband went first, and then it was my turn.
I know everyone's cancer experience is different. But for me losing my hair was not traumatic. And this is pretty funny now because my first concer when the oncologist came to my hospital room after my resection and told me I needed chemo was to ask about losing my hair! Everyone has always known me by my hair. Seriously it has been long and thick my entire life - I've never even had short hair. I thought it was a big part of who I was. I was very worried about losing it. But after going through everything else (colon resection, port insertion, infection, port removal, another port insertion, allergic reactions to chemo, thrush, nausea, diarrhea, pulmonary embolism, and the list goes on), losing my hair was nothing. Heck - it was only hair. I can't believe now that I was so concerned about it.
I've always looked awful in glasses, but good in hats. So I thought hats would be the answer. But I have a very small head, and now without all that thick hair, it is hard to find a hat that fits and isn't too large. I got a wig from a friend, but it isn't comfortable, and I don't think it looks natural. So, I wear hats when my head is cold, and nothing when I'm warm enough. Some people stare, but I don't care. People always stare at my husband and I anyway - two very tall people (6'8" and 5'11"). The same if I'm with my boys who are 6'5" and 6'8". So one way or another they are going to stare. That is their problem, not mine. Maybe I'm kidding myself, but I don't think I look that bad with no hair anyway. I've got lots bigger problems to worry about.
There are perks too - on FOLFOX I shaved my legs less than once per month. Normally I shave them every two days. The same goes for my underarms. I didn't lose my eyelashes or eyebrows, although they thinned. This time I still have them, but they have thinned. I didn't shave my underarms for almost two months, and just finally did again this morning because they were getting a little fuzzy. I lost my pubic hair, but a little grew back - also fuzzy. I've never had a Brazillian wax, but now I've experienced the results without having to spend the money or go through the waxing. Instead of having spikey hairs under my arms or elsewhere when the hair grows back, when it does grow a little, it is soft and fuzzy. The tops of my legs lost the hair, but for some reason the bottoms of my legs didn't lose it all. I did just shave them, after almost two months. They weren't really bad, but now I bet I won't have to shave them for another month or two. I don't have to worry about washing my hair hours before I leave the house so it will dry. I jump in and take a very fast shower since (other than today) I don't have to shave or shampoo! I towel dry and I'm ready to go. My hair doesn't blow in my face on windy days. I don't have to brush it. I'm saving $$ not buying shampoo or conditioner, or hair accessories. This really isn't bad - other than my ears and neck get cold a lot.
You can't really control whether you lose yours or not. Try not to worry about it. If it starts falling out, deal with it then. Compared to the other side effects of chemo, hair loss is the easy one.