Your coworker just told you she has breast cancer and is having a mastectomy. You want to help, but you're worried about saying the wrong thing, telling the wrong person, or giving something that makes it all worse. A few specific moves cover most of what matters.
If you're still replaying what you said, let it go
Almost no one has the right words in the moment, and your coworker isn't grading yours. What she'll remember is what you do from here, and you don’t have to overdo it. A short message a day or two later, something like "Thinking of you, no need to reply," does more than a perfect first reaction would have.
Going through a mastectomy is an extremely difficult and vulnerable time. Letting her know you’re there is a small way of telling her the news is safe with you and she doesn't have to explain or perform anything. That reassurance matters, especially in a workplace where she may be deciding who else to tell.
If you're worried about telling the wrong person, keep silent
Ask your coworker what she wants shared and with whom. Some people want the whole team informed so they can stop explaining absences. Others want it kept between two or three people. Don't announce it, don't mention it in a group chat, and don't pass it along "so someone else can help." The first thing you can give her is control over who knows.
If you want to be useful, be specific
Cover a recurring meeting, take a deadline off her plate, or handle a handoff before she's out. If you manage her, protect her leave and avoid asking when she'll be back. That date depends on her recovery, and pressure to name one adds stress she doesn't need.
If you're worried a gift will land badly, pool for something useful
Flowers wilt and cards stack up. If you or the team wants to send something, look through a list of the best gifts for breast cancer patients before defaulting to the usual, because the items people appreciate most tend to solve a specific problem at home during recovery. Pooling money also opens up options that would feel like too much from one person.
Know what her recovery involves so the gift fits
After a mastectomy, patients typically manage surgical drains, avoid lifting and overhead reaching, and are asked to sleep on their back in an elevated position for weeks. Most people spend years sleeping on their side or stomach without thinking about it, and household pillows flatten and shift within a couple of hours. A purpose-built mastectomy pillow addresses exactly that problem, and it's the kind of larger purchase that's easy to split across a team instead of asking one person to cover it.
Skip the questions that feel like curiosity
Don't ask about her prognosis, whether she's having reconstruction, or how she looks afterward. If she wants to talk about any of it, she'll bring it up. Comments like "you're so brave" or "you'll beat this" can also land poorly, because they assume how she feels about her own situation. "I'm thinking of you, and I've got your Thursday meeting" says more.
Remember week three
Attention peaks right around surgery and drops quickly afterward. By week three, the flowers are gone, the meal train has ended, and she's still recovering with fewer people checking in. A short text at that point, with no expectation of a reply, does more than a big gesture in week one. Put a reminder in your calendar if you need to.
Plan for her return, not just her absence
When she does come back, consider what accommodations she might need, such as a lighter lifting load or a more flexible schedule for follow-up appointments. You can then handle the logistics so she doesn't have to request each one herself.
Endnote
Rather than saying the perfect thing, you need to follow her lead, take real work off her plate, send something that helps at home, and keep checking in after everyone else has moved on.