In most cases, an employer cannot legally fire you because of a disability or serious medical condition. Under the federal Americans with Disabilities Act (ADA), it is illegal for a covered employer to discriminate against a qualified worker because of a disability, and that includes firing you for it. But the protection is not absolute: it generally applies to employers with 15 or more employees, it protects you only if you can do the essential parts of your job (with or without reasonable accommodation), and it does not stop an employer from firing you for legitimate, non-discriminatory reasons.
The Federal Baseline: The ADA
The main federal law here is the Americans with Disabilities Act, enforced by the U.S. Equal Employment Opportunity Commission (EEOC). The ADA applies to private employers with 15 or more employees, as well as state and local governments, employment agencies, and labor unions. A closely related law, the Rehabilitation Act, provides similar protection for federal employees and many employers that receive federal funding.
The ADA makes it unlawful to fire, refuse to hire, demote, or otherwise penalize a "qualified individual" because of a disability. "Qualified" means you can perform the essential functions of the job, either on your own or with a reasonable accommodation. The law also bars firing you in retaliation for asking for an accommodation, filing a complaint, or supporting someone else's complaint.
What Counts as a Disability?
The ADA defines disability broadly. It covers a physical or mental impairment that substantially limits a major life activity, such as walking, seeing, hearing, breathing, concentrating, or the operation of a major bodily function. It also protects you if you have a record of such an impairment (for example, a past cancer diagnosis) or if your employer regards you as having one, even if you do not.
Importantly, many conditions are covered even if they are managed, intermittent, or in remission. Cancer, diabetes, epilepsy, HIV, major depression, PTSD, and many other conditions are routinely treated as disabilities under the law. A temporary, minor injury (like a sprained ankle) usually is not, but a serious or lasting condition typically is.
Can I Be Fired for Having Cancer?
Generally, no, you cannot be fired simply because you have cancer or because you are undergoing treatment. Cancer is widely recognized as a disability under the ADA, even during remission, because it substantially limits the normal operation of cells and may limit other major activities. An employer cannot fire you out of fear that you will become a burden, that your insurance costs will rise, or that you "might" not be able to work in the future.
What an employer can do is expect you to meet the legitimate requirements of the job. If your condition genuinely prevents you from performing essential duties even with reasonable accommodation, the analysis becomes more complex. But "I assumed you couldn't handle it" is not a lawful reason; the employer must engage with you about accommodations first.
Reasonable Accommodation: The Heart of the Law
The ADA does more than ban discrimination, it requires employers to provide reasonable accommodations so you can keep working, unless doing so would cause "undue hardship" (significant difficulty or expense). Common accommodations include:
- Modified or part-time schedules, or time off for treatment and recovery
- Leave beyond standard policy as a reasonable accommodation
- Changes to equipment, workstations, or how a task is performed
- Remote work where the job allows it
- Reassignment to a vacant position you are qualified for
When you request an accommodation, the law expects both sides to take part in an "interactive process", a good-faith back-and-forth to find a workable solution. An employer that fires you instead of engaging in that conversation may be violating the ADA. You do not have to use the magic words "reasonable accommodation"; simply telling your employer you need a change at work because of a medical condition can trigger their obligations.
FMLA: Job-Protected Medical Leave
Separate from the ADA, the federal Family and Medical Leave Act (FMLA), enforced by the U.S. Department of Labor's Wage and Hour Division, gives eligible employees up to 12 weeks of unpaid, job-protected leave per year for a serious health condition (your own or a close family member's). To be eligible you generally must work for an employer with 50 or more employees within 75 miles, have worked there at least 12 months, and have logged a minimum number of hours in the prior year. Firing someone for taking valid FMLA leave is unlawful interference or retaliation. The ADA and FMLA often overlap, and you may be protected by both at once.
When Firing May Still Be Legal
Most U.S. workers are employed "at will," meaning either side can end the relationship at any time for almost any reason, or no reason, as long as it is not an illegal reason. A firing tied to your disability is illegal. But you can still be let go for lawful reasons that happen to coincide with a medical issue, such as: