How to Call In Sick: What to Say and What Your Employer Can Ask

How do you call in sick professionally?

Calling in sick professionally comes down to four things: notify early, use the right channel, say enough but not too much, and follow up. Notify as soon as you know you cannot work, ideally before your shift or workday starts, following whatever channel your company designates (a call, a message to your manager, or the absence system). Say that you are unwell and unable to work, give an expected duration if you can, and flag anything urgent that needs covering. You generally do not have to share a diagnosis. Check your company's sick leave policy for documentation rules: many US employers ask for a doctor's note after three or more consecutive days, and some sick leave laws limit when a note can be required. If you stay out longer than expected, update your manager before your last communicated day ends. A short, factual message beats a long apology: Being sick is normal, and a clear process protects both sides.

When to notify: as early as possible

The single most important rule is timing. Tell your employer as soon as you know you cannot work: before your shift or workday begins, not mid-morning. Early notice is what lets a team arrange coverage, and late notice is what turns a normal sick day into a reliability question.

If you wake up unsure, err on the side of notifying early and updating later. A retracted sick notice costs nothing; a missing one does.

What to say (and a template that works)

Keep it short and factual: you are unwell, you cannot work today, here is the expected duration, and here is anything urgent that needs covering. You do not need to describe symptoms or share a diagnosis.

A message that works in almost every workplace: 'Hi [manager], I'm feeling unwell and won't be able to work today. I expect to be back [tomorrow / by Thursday] and will update you if that changes. [X] is the only urgent item on my plate, [colleague] has context.' That is the whole message.

Which channel to use

Follow the company's designated channel: Some workplaces require a phone call, others accept a message or a request in the absence system. If no channel is defined, message your direct manager and log the absence in whatever system the company uses.

Avoid the two extremes: telling only a colleague (the manager finds out at standup) and broadcasting to everyone (unnecessary). One notification to the right person, plus the system entry, covers it.

Valid reasons and the diagnosis question

Any illness or injury that genuinely prevents you from working is a valid reason to call in sick, including mental health days where your company's policy or local sick leave law covers them. Many state and city paid-sick-leave laws also cover caring for a sick family member and medical appointments.

You are generally not required to share a diagnosis with your employer. Employers can ask about expected duration and urgent handovers; detailed medical information is between you and your doctor. TODO: verify jurisdiction-specific privacy rules before publish.

Doctor's notes: when they can be required

There is no single US rule. Common practice is that employers may ask for a doctor's note after three or more consecutive sick days, and policies say so explicitly. Several state and city paid-sick-leave laws restrict note requirements for short absences, some only allow them after three consecutive days. TODO: verify the current rules for your jurisdictions before publish.

For comparison, other countries codify this: in Germany, a medical certificate is legally required from the fourth calendar day (employers may demand it from day one), and since 2023 it flows electronically from the doctor to the employer via the health insurer. The German version of this article covers those rules in detail.

What employers can and cannot ask

The line is practical: employers can ask what they need for planning, not what satisfies curiosity.

Multi-day absences: keep the updates flowing

If you are out more than a day, the follow-up matters as much as the first notice. Update your manager before your last communicated day ends. Silence is what creates friction, not the length of the absence.

If the illness stretches further, documentation rules usually kick in (a doctor's note, short-term disability paperwork, or FMLA for serious conditions). Knowing your company's thresholds in advance makes a stressful week easier.

For employers: make calling in sick easy

On the company side, the process decides everything: one clear channel, a defined notice expectation, sick days tracked separately from vacation, and automatic reminders for missing documentation.

Confidentiality is part of it: sickness data is sensitive, and who can see which absence type should be explicitly configured, not left to default visibility. A system that handles this removes the awkwardness for everyone.