Symptoms of erythrocytosis include reddish purple coloration of the face and hands and feet, headache, dizziness, and bleeding. It may be accompanied by high blood pressure and hepatosplenomegaly. 1. Erythrocytosis is a group of syndromes in which the number of red blood cells per unit volume of blood, the amount of hemoglobin, or the hematocrit is higher than the upper reference limit due to various reasons. Symptoms vary greatly. Common typical symptoms include skin color changes such as reddening and purpling of the face, hands and feet and mucous membranes, and central nervous system symptoms such as headache and dizziness. 2. Due to hypervolemia and hyperviscosity, venous thrombosis may occur, thus causing corresponding clinical manifestations. In addition, there may be bleeding from different parts of the body, such as nosebleed, gum bleed and so on. It is often accompanied by elevated blood pressure and hepatosplenomegaly. If secondary to other diseases, it may be accompanied by the manifestations of the primary disease. Due to the insidious onset and slow development of the disease, once the relevant symptoms appear, it is necessary to consult a doctor and receive treatment under the guidance of a physician to avoid delaying the condition.