Lung has two main vascular systems that include pulmonary circulation and bronchial circulation. There are multiple anastomoses between pulmonary and bronchial arterieswhich create physiologic right to left shunts. Blood in the<unk>  is mostly originated from the Lung. However, it could be from the gastrointestinal system as well. Primary origin of the blood comes from bronchial arteries.<unk>  is an important symptom that has different etiologies and pathogenesis mechanisms.<unk>  may happen following infarction and ischemia of pulmonaryparenchyma and vascular engorgement with erosion.<unk>  may be classified according to severity into 3 groups of mild, moderate, and massive bleeding. Life-threatening causes of<unk>  include pulmonary embolism. Common causes of<unk>  include bronchiectasis, acute respiratory tract infections, chronic obstructive pulmonary disease, bronchitis, pneumonia, lung cancer, tuberculosis, cystic fibrosis, and idiopathic.
Hemoptysis
Round pneumonia
Hemothorax laboratory findings
Subcutaneous emphysema
Lung mass other imaging findings
Nasal Congestion
Hydrothorax
Trapped lung