Hemothorax is a medical condition where blood accumulates in the pleural cavity, the space between the lungs and the chest wall. This can occur due to trauma, such as a car accident or a fall, or from medical conditions like tumors or blood vessel rupture. The presence of blood in this area can compress the lungs, making it difficult to breathe. Symptoms of hemothorax may include chest pain, shortness of breath, and rapid heart rate. Diagnosis is typically made through imaging tests like chest X-rays or CT scans. Treatment often involves draining the blood using a procedure called thoracentesis or placing a chest tube.