Many people sitting in chairs, will habitually stretched legs, think it is more comfortable. Some professional women also stretched their legs as an elegant posture. However, experts warned that stretched legs may cause a lot of disease. For this reason, the United States also launched a campaign to require women to “stop crossing their legs for a day”. Disease one: may cause varicose veins in the legs or thrombosis. When the legs are crossed, the knees are compressed by the pads, which can easily affect the blood circulation in the lower limbs. Both legs remain in one position for a long time, easy to numb, if the blood circulation is then blocked, it is likely to cause varicose veins or thrombosis in the legs. “Especially the elderly suffering from hypertension, diabetes, heart disease, long time stilts will make the condition worse.” Liu Deping suggested that when you feel numbness or soreness in the muscles of both legs, you should immediately put them flat and rub or pat them with both hands repeatedly to relieve fatigue and restore blood flow as soon as possible. Disease two: affect male reproductive health. The habit of stretched legs is bad for reproductive health. When stilting, the legs are usually clamped too tightly, making the temperature around the inner thighs and genitals rise. For men, this high temperature can damage the sperm, and in the long run, this may affect fertility. For this reason, it is best not to cross your legs for more than 10 minutes, do not cross your legs too tightly, if you feel sweat seeping out of your inner thighs, it is best to walk in the ventilation for a while to dissipate heat as soon as possible. Especially when sitting in the bus, if you meet the emergency brake, crossed legs can not be flattened, easily lead to dislocation of bone and joint muscle damage. Disease three: lead to spinal deformation, causing lower back pain. The normal spine of the human body from the side should be “S” shape, while the legs are easy to hunch over, over time, the spine will form a “C” shape, resulting in uneven pressure distribution between the lumbar and thoracic spine. In the long run, it will also compress the spinal nerve, causing lower back pain. Disease four: the appearance of bone lesions or muscle strain. When stretched legs, the pelvis and hip joints due to long-term pressure, easy to sore, over time may appear bone lesions or muscle strain. If you feel back pain, you can do two minutes of stretching or chest expansion exercises, turn the cervical spine around, or lean on the chair to rest for a while. In addition, experts also recommend that long-term sitting people, it is best to maintain the correct sitting posture, less legs stretched. If you can’t change it, don’t stilt your legs for too long, you should change your sitting posture in a few minutes, or stand up and move your muscles and bones after an hour.