The most common symptoms of pulmonary oedema are dyspnoea and telangiectatic breathing. Patients may also be irritable, have a feeling of suffocation, and in severe cases may be unconscious. Patients also have the corresponding clinical manifestations of the primary disease. Patients with chronic left ventricular insufficiency, for example, may develop a cough, which is often an early sign of progressive pulmonary oedema, and in severe cases, coughing up pink, frothy sputum.