If an adult male appears to have a short lower extremity or a slightly short lower extremity after measurement, there is no need for concern or treatment if the lower extremity is not dysfunctional or deformed and does not affect daily work, study or sports, except for other systemic diseases. For boys who are growing during puberty, if there is a delay in the development of the lower limbs or if the lower limbs are short, a systemic hormone level check and a bone age test should be performed to understand the growth and development of the bones. After the exclusion of systemic diseases and abnormal skeletal growth and development, adequate nutrition, good sleep and moderate outdoor physical exercise can promote the growth and development of the lower limbs.