Below the navel there is a line, if it is vertical usually refers to the abdominal line, belongs to the normal physiological situation, if it is a horizontal line may be obesity and other causes of symptoms. 1. Vertical line: when the body pigmentation is more obvious, the line is more obvious, if the skin is more white, the line may not be too obvious. If the line will be obvious during pregnancy, it is a normal physiological phenomenon due to the elevated level of hormones in the body, which produces the pregnancy line. 2. Horizontal line: If patients appear horizontal line under the navel, may also be obesity and other causes of obesity lines, due to the body’s skin elasticity becomes smaller and the symptoms, patients should pay attention to exercise in daily life to avoid abnormal weight. If it is a normal physiological situation generally do not need to go through special treatment, obese patients in daily life to more physical exercise, will be maintained in the normal range of body weight, the emergence of abnormalities in a timely manner to seek medical attention.