Lying down comfortably and squatting uncomfortably may be caused by lumbar intervertebral disc herniation, lumbar muscle strain, tendonitis and other factors. 1. Lumbar intervertebral disc herniation: squatting will lead to the upper body’s strength concentrated in the lumbar region, so that the lumbar intervertebral discs are subjected to excessive stress stimulation, thus compressing the surrounding nerves to cause pain in the lumbar region, numbness in the lower limbs and other uncomfortable symptoms. Lying flat will reduce the load on the lumbar region and will not cause damage to the surrounding tissues, thus making it comfortable to lie flat without discomfort. 2. Lumbar muscle strain: prolonged use of the waist for labor activities will lead to lumbar muscle injury, edema, fibrous degeneration of sterile inflammation, squatting will aggravate the lumbar inflammation stimulation, resulting in a strong uncomfortable feeling. 3. Tendonitis: strenuous exercise or irregular exercise, will lead to spasm of the tendon tissue, blood circulation, the human body squatting will aggravate the inflammation of the tendon, spasm, resulting in squatting uncomfortable, lying comfortable situation. In order to clarify the causes of lying comfortably and squatting discomfort as soon as possible, it is recommended to go to the regular hospital for professional and effective examination.