The human body is roughly symmetrical from left to right, but not completely, and there will be subtle gaps that can be caused by congenital genetic factors or due to acquired behaviors, diseases, and environmental factors. There is no need to worry excessively when there is generally no discomfort, while the internal organs are asymmetrical. Generally, the asymmetry of human body shape from left to right caused by congenital genetic factors is mostly normal if there is no congenital disease, and the performance is relatively subtle and not easily detectable. If there are congenital disorders, such as brief hemifacial deformities, cleft lip and palate, etc., which can cause facial asymmetry, obvious deformities can usually be seen and usually require surgical treatment. And acquired factors, such as standing, sitting, commonly used hands, commonly used teeth and other habits, or the nature of work and other factors influence, may lead to one side of the limb or facial muscles more developed than the other side, appearing left and right asymmetry. In addition, the cervical vertebrae, lumbar vertebrae, shoulders and other trunk positions will slowly form vertebral protrusion and left-right asymmetry if they are compressed for a long time. Some diseases such as cysts, nodules, fractures, tumors, strokes, etc. may also lead to significant changes in body shape, such as swelling on one side, crooked mouth and slanted eyes. Organs in the body such as the heart, liver, and gastrointestinal tract are also not symmetrical, but just not clearly observable inside the body. The heart is located on the left side of the body, while the liver is on the right side of the body, and the gastrointestinal tract is not symmetrical, and the human respiratory system, the trachea and bronchi are not the same, with the left side being flat and thin and the right side being short and thick and slightly different. Even if the body is symmetrical at birth, it will slowly become asymmetrical as it grows older and is affected by lifestyle habits or diseases, but it will not be particularly obvious. If the left-right asymmetry is more obvious, or there is pain, lumps, redness and swelling, it is recommended to go to the hospital for medical consultation.