Chronic Thromboembolic Pulmonary Hypertension (CTEPH) is a serious condition that occurs when blood clots in the lungs do not dissolve and lead to increased blood pressure in the pulmonary arteries. This can cause symptoms such as shortness of breath, fatigue, and chest pain, making it difficult for individuals to perform daily activities. CTEPH often develops after a pulmonary embolism, which is a blockage in the lung's blood vessels. Diagnosis typically involves imaging tests like CT scans and echocardiograms, and treatment options may include medications, surgery, or other interventions to improve blood flow and reduce pressure in the lungs.