Forced squatting patients in a squatting position or knee-chest position to relieve dyspnea and palpitations during walking or other activities. The following is the differential diagnosis of forced squatting: 1, forced supine position (compulsivelyingontheback): the patient lies on his back with legs flexed to reduce tension in the abdominal muscles, seen in acute peritonitis. 2, forced prone position (compulsivelyingontheface): prone position can make the muscles of the spine and back relaxation, seen in spinal disease. 3, forced sitting position (sitting breathing, orthopnea): sitting position, hands on the knees or support the side of the bed, in order to make the diaphragm fall to increase lung volume and lower extremities to reduce the return blood volume, to reduce the burden on the heart, seen in cardiac and pulmonary insufficiency. 4, forced lateral position: pleurisy patients lie more to the affected side, mainly to reduce chest pain; a large number of pleural effusion patients lie more to the affected side mainly to reduce respiratory distress.