Anemia is a condition caused by inadequate amounts of red blood cells or a lack of hemoglobin in the bloodstream. Patients with anemia often experience some strange symptoms such as extreme fatigue, pale skin, lightheadedness or dizziness, shortness of breath, and rapid heartbeat. In addition, anemia can cause cold hands and feet, brittle nails, headaches, and chest pain. Other symptoms can include a sore tongue, difficulty concentrating, and cravings for certain non-nutritive substances, such as dirt and clay. Finally, anemia can also cause hair loss, ringing in the ears, and difficulty sleeping. All of these symptoms require medical attention, as anemia can be treated with dietary changes, supplements, or medication.