See a doctor to confirm the cause of high hemoglobin
Treat underlying conditions such as sleep apnea, lung disease, heart disease, or dehydration
Drink enough water to avoid dehydration
Stop smoking
Avoid high-altitude exposure if possible
Review medications and supplements with a doctor
Reduce iron intake only if advised by a doctor
Avoid iron supplements unless prescribed
Limit vitamin C supplements if they increase iron absorption and your doctor advises it
Donate blood only if approved by a healthcare professional
Undergo therapeutic phlebotomy if prescribed
Follow treatment for polycythemia vera or other blood disorders if diagnosed
Monitor hemoglobin levels regularly as directed by a doctor