Pulmonary hypertrophy is a condition in which some parts of the body become swollen, enlarged and painful because of a lung disease. Common pulmonary hypertrophy disorders include pulmonary hypertrophic osteoarthropathy. Pulmonary hypertrophic osteoarthropathy is a clinical imaging syndrome that includes pestle and mortar fingers (toes), osteochondritis of the long bones, and arthritis, the onset of which is mostly associated with pulmonary lesions. More than 70% are reported in the literature as secondary to peripheral lung cancer, and others such as tuberculosis, lung abscess, pneumonia, pleurisy, and mediastinal tumors can cause it. So, how to differentially diagnose pulmonary hypertrophic osteopathy? The following is a brief introduction: a. Pulmonary hypertrophic bone disease is often clinically divided into three types: 1. pestle-like finger (toe) type: the end of the finger (toe) is a bulge-like hyperplasia, occurring quickly, with pain and nail bed surrounded by redness, often for the early clinical manifestations of the disease or the only clinical symptoms. 2, rheumatoid-like joint type: joint swelling and pain, restricted movement, may be accompanied by low fever, similar to the symptoms of rheumatoid arthritis. 3, acromegaly: characterized by pain at the end of long bones, periosteal hyperplasia, new bone formation, painful joint swelling, but no joint deformity or ankylosis, similar to acromegaly. The diagnosis of this disease is based on: 1. gradual appearance of pestle-like fingers (toes), pain, swelling and limitation of movement in the large joints of the extremities. 2. What is seen on X-ray: early stage only pestle-like fingers (toes) without skeletal changes, late stage chronic progressive and symmetrical periosteal growth of most long bones, such as lace-like or onion-like changes, mostly in the tibia-fibula or ulnar radius. 3, with intrathoracic lesions (mainly malignant tumors of the lung) as supporting evidence.