Woke Up With a Fever Before Surgery? Here Is What to Do.

You have done everything right. You followed your pre-op instructions, adjusted your medications, arranged your recovery space, and prepared mentally for the procedure. Then you wake up on the morning of your surgery and something feels off.

You have a fever.

Your first thought might be to push through. You have waited weeks for this date. Rescheduling feels frustrating. But a fever before surgery is your body sending a clear signal: something is wrong, and operating right now introduces avoidable risk.

Pick up the phone and call your surgeon.

Why a Pre-Surgery Fever Matters

A fever means your body is actively fighting an infection. That changes everything about how your body responds to surgery, anesthesia, and recovery. Here are three reasons your surgical team needs to know immediately.

Anesthesia becomes riskier.

An active infection disrupts your body’s normal physiology. Your heart rate, blood pressure, and respiratory function are already under stress from the infection. Adding general anesthesia on top of that increases your risk for respiratory and cardiovascular complications during the procedure.

Your healing slows down.

Your immune system is already working hard to fight the infection. Surgery creates additional wounds that need immune resources to heal. When your body is fighting on two fronts, tissue repair slows, swelling increases, and your overall recovery timeline stretches longer than expected.

Surgical site infections become more likely.

Operating while an active infection is present raises the chances of bacteria reaching the surgical site. A post-operative infection at the incision site or internally is one of the most serious complications in surgery and one of the most preventable when the team knows about your fever in advance.

What Happens When You Call.

Your surgical team will assess your temperature, ask about your specific symptoms, and evaluate the urgency of your procedure.

If your surgery is elective (cosmetic procedures, joint replacements, and similar planned operations), you will likely be rescheduled to a time when your body is fully recovered. This protects both your safety and your results.

If your surgery is a life-saving emergency, the surgical and anesthesia teams will proceed. They will adjust their techniques and medications to manage your illness safely during the operation.

Either way, calling is the right decision.

When to Make the Call.

Call the number provided in your pre-operative paperwork right away. Do not wait for the clinic to open. Surgical centers have on-call triage protocols for exactly these situations. Even if it is 4 AM, someone is available to guide you.

Not every surgery delay comes from abnormal lab results. Sometimes your body is telling you it is not ready through symptoms you feel but a blood test would not catch.

Ask yourself:

Do you have a fever?
Are you feeling dizzy?
Do you have flu symptoms?
Are you experiencing nausea, chills, or body aches?
Do you feel different from how you normally feel?

If the answer to any of these is yes, call your surgeon or surgical coordinator before leaving your house.

Honesty Protects Your Recovery.

It is tempting to downplay symptoms because you do not want your procedure delayed. But hiding a fever or brushing off flu symptoms does not make the risks disappear. It removes your surgical team’s ability to protect you.

Being upfront about how you feel gives your team the information they need to make the safest decision for your body on that specific day. If the surgery moves forward, they adjust for your condition. If it gets rescheduled, you recover from the infection first and go into surgery stronger.

A Safe Healing Reminder.

Being honest about your symptoms helps your surgical team provide the safest care possible. A short delay is always better than a preventable complication.

If something feels off, make the call.