Red blood cells carry oxygen to every organ in your body, so an abnormal count on your bloodwork is worth understanding. A low red blood cell count usually points to anemia, which can cause fatigue, shortness of breath, dizziness, pale skin, and cold hands and feet. A high count is less common but may be linked to dehydration, smoking, COPD, untreated sleep apnea, testosterone therapy... https://kelhealthcaremedical.com/blogs/high-or-low-red-blood-cell-count-what-your-bloodwork-is-telling-you