The most common causes of pterygoid scapula are trauma, muscle disease, nerve injury and so on. 1. Trauma: If the location of the scapula is traumatized, it is easy to cause a decrease in the contraction ability of muscles such as the anterior serratus, trapezius and rhomboid muscles, and then pterygoid scapula appears. 2. Muscle disease: some patients may have muscular dystrophy, which may slowly cause muscle weakness and atrophy at the scapula, and ultimately pteroscapular scapula will appear. 3. Nerve damage: If the patient has neurological disease or nerve damage, it will easily cause atrophy of the corresponding innervated muscles, which may also lead to the formation of pterygoid scapula. The causes of pterygoid scapula are many, if the patient accompanied by obvious discomfort symptoms, it is recommended to go to the hospital in time to identify the cause of the disease, and carry out targeted treatment.