Erythrocytes (red blood cells) are vital cells that carry oxygen to the body's tissues. Low erythrocyte levels (anemia) can manifest with various symptoms. A complete blood count test is performed to diagnose this condition, and erythrocyte levels are evaluated along with other values such as hemoglobin and hematocrit.

The main symptoms of low erythrocytes (anemia) include:
* Excessive fatigue and weakness
* Shortness of breath and difficulty breathing
* Dizziness and headache
* Increased heart rate or irregularity
* Pale skin color and appearance
* Low energy and quick exhaustion
* Irritability
* Severe chest pain (in rare and advanced cases)
* Leg cramps
* Insomnia