Yes, blood pressure can go up when you’re sick, but it’s usually temporary and related to how your body responds to illness.

Why blood pressure can rise when sick

When you’re ill (with a cold, flu, or infection), your body is under stress , and several things can push blood pressure up.

  • Stress hormones (adrenaline, cortisol) are released, making your heart beat faster and blood vessels tighten, which raises blood pressure.
  • Fever, pain, and inflammation make the heart work harder to move blood and immune cells around the body.
  • Dehydration from sweating, vomiting, or diarrhea can initially lower blood volume, but as the body compensates, pressure can rise.

Common illnesses and blood pressure

Not everyone sees a rise, but it’s common in many everyday illnesses.

  • Colds and flu can cause temporary increases in blood pressure because of fever, stress, and faster heart rate.
  • Infections like pneumonia or urinary tract infections can trigger inflammation and stress, which can also raise blood pressure.
  • Over‑the‑counter cold medicines with decongestants (like pseudoephedrine) can constrict blood vessels and increase blood pressure further.

When it’s usually normal vs. worrisome

For most otherwise healthy people, the rise is mild and goes away after recovery.

  • “Normal” sick-time changes are small, temporary bumps that settle once the fever, pain, and stress improve.
  • Be more cautious if you already have hypertension, heart disease, kidney disease, or are older, because spikes can be more significant.
  • Seek urgent care if readings are very high (for example, around 180/120 or higher) or you have chest pain, severe headache, shortness of breath, confusion, or vision changes.

What you can do at home

Simple steps can help keep things safer while you’re sick.

  • Rest, stay hydrated, and avoid overexertion so the cardiovascular system doesn’t work harder than it has to.
  • Check labels and avoid decongestants if you have high blood pressure; ask a clinician or pharmacist for safer options.
  • Monitor your blood pressure once or twice a day while sick if you have a history of high blood pressure, and note any unusual spikes or symptoms.

When to call a doctor

Contact a healthcare professional if any of the following apply.

  • Your blood pressure stays higher than your normal even after you start feeling better.
  • You have repeated high readings plus symptoms like chest pain, pounding headache, or shortness of breath.
  • You’re unsure whether your readings are safe, especially if you have existing cardiovascular or kidney issues.

Information gathered from public forums or data available on the internet and portrayed here.