Guide for individuals
Disclosing a Cancer Diagnosis at Work
One of the most personal decisions you will face after a diagnosis is whether to tell your employer. There is no single right answer — but there are ways to think it through, prepare for the conversation, and protect yourself along the way.
You are not required to disclose your diagnosis
Under Canadian human rights legislation, you are generally not required to tell your employer that you have cancer. What you may need to disclose — if you are requesting accommodation or leave — are the functional limitations that affect your ability to do your job. Your diagnosis is yours to share or not share.
That said, many people find that some level of disclosure makes it easier to access support, request accommodations, and maintain their working relationships. This guide walks you through the key considerations, the different levels of disclosure, how to prepare for the conversation, and what to do if things don't go as expected.
Should you disclose?
There is no obligation to disclose, but there are practical reasons why some people choose to. Consider these factors as you decide:
You need accommodations
If your treatment or recovery affects your ability to work — your schedule, energy, concentration, or physical capacity — you will likely need to share some information to access accommodations or leave. You don't have to name your diagnosis, but you will need to describe your limitations.
Leans toward disclosureYou want your manager's support
Some people find it easier to manage their workload and relationships when their manager understands what they are going through. A supportive manager can make a significant difference in how you experience work during treatment.
Leans toward disclosureYou are concerned about confidentiality
Once you disclose to HR or your manager, you have limited control over who else finds out. If privacy is important to you — especially in a small workplace — this is worth weighing carefully.
Leans toward privacyYou are worried about how you will be treated
Discrimination based on disability is illegal, but it can still happen in subtle ways. If you have concerns about your workplace culture or your manager's response, it is reasonable to be cautious about what you share and with whom.
Leans toward privacyYour performance may be affected
If your work is likely to be impacted by treatment — missed deadlines, reduced output, more sick days — disclosing proactively can help frame those changes in context and protect your professional standing.
Leans toward disclosureYou simply want people to know
Some people find it exhausting to keep a significant health situation private. If being open feels right for you and your workplace, that is a valid reason to disclose — on your own terms.
Leans toward disclosureLevels of disclosure
Disclosure is not all-or-nothing. You can choose how much to share, with whom, and when.
Functional only
You share only the limitations that affect your work — for example, that you have a medical condition requiring you to attend appointments on Tuesday mornings, or that you need to work from home during a recovery period. You do not name the condition.
Best for: People who want accommodations without full disclosureDiagnosis to HR only
You share your diagnosis with HR or occupational health, but ask that it remain confidential and not be shared with your manager or colleagues. HR has a duty of confidentiality and should not disclose without your consent.
Best for: People who want formal support but value privacyDiagnosis to your manager
You tell your direct manager what you are dealing with so they can support you, adjust expectations, and advocate for you within the team. This is often the most practical level for day-to-day working relationships.
Best for: People with a trusted manager and a need for flexibilityOpen disclosure to your team
You choose to be open with your colleagues about your diagnosis. This can reduce the burden of secrecy, invite support, and help explain changes in your availability or capacity. It is entirely your choice.
Best for: People who prefer openness and have a supportive teamWhen to disclose
There is no perfect moment, but timing matters. Many people choose to disclose once they have a clear treatment plan and know how their work will be affected — rather than immediately after diagnosis, when things are still uncertain and emotions are raw.
If you need to take time off for surgery or start a leave of absence, you will likely need to disclose before that point. If your treatment is manageable and your work is largely unaffected, you may choose to wait — or not disclose at all.
Avoid disclosing during a performance review, a period of workplace conflict, or a time of significant organizational change if you can help it. Choose a calm, private moment when you have time to talk.
How to have the conversation
Prepare what you want to say
Decide in advance what you are comfortable sharing. You do not need to answer every question in the moment. It is reasonable to say: 'I am not ready to share all the details yet, but I wanted you to know what is happening.'
Choose the right setting
Ask for a private meeting — not a hallway conversation. If you are disclosing to HR, request a formal meeting and consider whether you want a support person present. If you are disclosing to your manager, choose a time when neither of you is rushed.
Lead with what you need
Rather than leading with the medical details, consider leading with the practical impact: 'I have a health situation that will require me to attend medical appointments on some mornings over the next few months. I would like to discuss how we can manage that.' This keeps the conversation focused and professional.
Set expectations about confidentiality
If you want your disclosure to remain confidential, say so explicitly: 'I am sharing this with you in confidence. I am not ready for this to be shared more broadly.' HR is bound by confidentiality obligations; managers generally are too, though it is worth stating clearly.
Follow up in writing
After the conversation, send a brief email summarizing what was discussed and agreed — the accommodations requested, the confidentiality expectations, and any next steps. This creates a record and reduces the risk of misunderstanding.
Sample language
You do not need to use these exact words — adapt them to your voice and situation.
Disclosing to your manager
“I wanted to speak with you privately about something personal. I have been diagnosed with a health condition that will require ongoing treatment over the coming months. I expect it will affect my schedule on some days, and I may need some flexibility around appointments. I am committed to my work and want to make sure we can plan around this together. I would appreciate your support and your discretion.”
Disclosing to HR without naming the diagnosis
“I have a medical condition that qualifies as a disability under the Human Rights Code. I am not ready to share the specific diagnosis, but I would like to discuss what accommodations I may be entitled to and how to proceed. I would also like to understand how my information will be kept confidential.”
Responding to questions you are not ready to answer
“I appreciate you asking. I am not ready to share all the details right now, but I will keep you informed as things become clearer. What I can tell you is what I need in terms of support and flexibility.”
Your rights
Disclosing a disability — including cancer — does not give your employer the right to treat you differently, demote you, reduce your hours without consent, or terminate your employment. Discrimination based on disability is prohibited under the Canadian Human Rights Act and every provincial human rights code.
If you experience negative treatment after disclosing, document it carefully — dates, what was said, who was present. You have the right to file a complaint with the relevant human rights commission or tribunal. You may also wish to consult an employment lawyer.
Your medical information is confidential. Your employer cannot share your diagnosis with colleagues, clients, or others without your consent. If this happens, it may constitute a breach of privacy legislation in addition to human rights law.
Know your rights before you have the conversation
Understanding your legal right to accommodation can help you approach disclosure with confidence. Our workplace accommodations guide explains what you are entitled to and how to ask for it.