Blood deficiency is characterized by a pale tongue. Blood deficiency is mostly caused by poor innate constitution, prolonged illness, excessive thinking, weak spleen and stomach, and excessive blood loss. Patients with blood deficiency mainly show pale or yellowish color, dry hair, dry skin, dizziness, insomnia, dreamy, irritable, pale tongue, etc., as well as women’s menstruation is small and pale, and in severe cases, amenorrhea can also occur. Patients with blood deficiency should lead a regular life, live in a quiet environment, stay away from noise, and avoid wind and cold; they should ensure sufficient sleep and avoid overwork; they should pay attention to the combination of work and rest, and emphasize on physical exercise, such as taking a walk, Five Animal Circus, Eight Duan Jin, and Taijiquan. When the above symptoms occur, patients should seek medical diagnosis in time to avoid delaying the condition.