Constrictive pericarditis refers to the fibrosis or calcification of the pericardium, which restricts the filling of the ventricles during diastole and leads to a series of symptoms. What causes constrictive pericarditis? Generally, constrictive pericarditis is secondary to acute pericarditis. In our country, the most common cause of constrictive pericarditis is tuberculous pericarditis, followed by purulent or traumatic pericarditis. A minority of constrictive pericarditis cases may be associated with tumors of the pericardium, acute nonspecific pericarditis, and radiation-induced pericarditis, among others. Of course, some patients have idiopathic constrictive pericarditis.