When to see a doctor

By Mayo Clinic Staff

A very high hemoglobin count can lead to symptoms. Talk with your healthcare professional if you have symptoms such as:

  • Trouble with vision.
  • Dizziness.
  • Headache.
  • Slurred speech.

Keep in mind that these symptoms can happen for many different reasons. It's more common to find a high hemoglobin count during a routine blood test or a test checking for another condition. Your healthcare professional likely will do more tests to help figure out the cause of the high hemoglobin count.

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Feb. 15, 2025