Respiratory disease could be a medical term that encompasses pathological conditions poignant the organs and tissues that build gas exchange attainable in higher organisms, and includes conditions of the higher tract, trachea, bronchi, bronchioles, alveoli, serosa and bodily cavity, and therefore the nerves and muscles of respiratory. Metastasis diseases is also caused by infection, by smoking tobacco, or by inhaling secondhand tobacco smoke, radon, asbestos, or different kinds of pollution. Metastasis diseases embody asthma attack, chronic preventative pulmonic illness, pulmonic pathology, pneumonia, and carcinoma. Its conjointly referred to as respiratory organ disorder and pulmonic illness. The study of respiratory disorder is thought as pulmonology. A doctor World Health Organization focuses on respiratory disorder is thought as a pulmonologist, a chest medication specialist, a metastasis medication specialist, a respirologist or a medicine specialist. Metastasis diseases are often classified in many various ways that, as well as by the organ or tissue concerned, by the sort and pattern of associated signs and symptoms, or by the reason behind the illness.