Pallor of the skin and mucous membranes is commonly caused by anemia, after a major blood loss, indicating insufficient blood volume and a decrease in hemoglobin. It is caused by spasm of capillaries in the skin or insufficient filling of blood, as well as a decrease in the amount of hemoglobin in the blood, and can be seen in cold, panic, deficiency, as well as aortic valve closure insufficiency, anemia, and internal bleeding. It can be improved by a balanced diet, usually with foods rich in protein and vitamins; appropriate physical activity to enhance the body’s immunity; and active and timely treatment if there is a primary disease. What tests are needed for pale skin mucosa? 1.Visible mucous membrane usually check conjunctiva, lips, finger nails. 2.Blood pressure check: diastolic blood pressure is below 60 mmHg and systolic blood pressure is below 90 mmHg in case of shock. 3.Blood test: Red blood cells and hemoglobin are reduced in case of anemia. 4.Glucose examination: When hypoglycemic reaction occurs, blood sugar will be lower than the normal index. 5.Electrocardiogram examination: preliminary understanding of whether the symptoms are due to heart disease by electrocardiogram examination. 6.Comprehensive consideration of various examination results, combined with the clinical symptoms of various organ damage, and finally arrive at the corresponding diagnosis.