There is no clear how to increase height by 20 centimeters, teenagers can generally increase their height by getting enough sleep, exercising and taking calcium supplements. However, it is generally impossible to increase height in adults, and the situation varies from person to person. Patients who find obvious abnormalities in height are advised to seek timely medical attention. 1. Adequate sleep: Because the human pituitary gland secretes growth hormone during sleep, adequate sleep helps the human body to increase height. At the same time, pay attention to the correct sleeping position and good sleeping habits. 2. Jumping: jumping can effectively stimulate the secondary growth of bones, you can take jump rope, basketball and other sports to increase height. As long as you can adhere to the appropriate exercise, the effect will be more obvious. 3. Calcium supplement: If you have a calcium deficiency, you can supplement vitamin D and calcium tablets, such as calcium gluconate and calcium carbonate, under the guidance of your doctor. By promoting the growth and development of bones, it can help the growth of height. If the height is significantly lower than that of the same age, it is recommended that the patient should consult a doctor in time for a clear diagnosis and treatment under the guidance of a professional doctor.