Question: What causes Yellow nail syndrome ?
Answer: Has a genetic cause of familial yellow nail syndrome been discovered? The exact cause of yellow nail syndrome remains unclear. There have been reports of several members in the same family being affected with this condition and also reports of children being affected at young ages. These reports have been used to suggest the possibility a genetic component to yellow nail syndrome. However, the possibility of a genetic cause for yellow nail syndrome remains a subject of debate, as most cases of this condition occur by chance in individuals who do not have a family history of this condition. Unfortunately, because there are so few cases of familial yellow nail syndrome, there is limited information and currently no known research about possible genetic causes.
Source: GARD

Question: What are the treatments for Yellow nail syndrome ?
Answer: How are the respiratory conditions associated with yellow nail syndrome treated? You can find further information on treatment of pleural effusions, bronchitis, sinusitis, and pneumonia at the following links to MedlinePlus.gov, the National Library of Medicine Web site designed to help you research your health questions. Pleural effusions: http://www.nlm.nih.gov/medlineplus/ency/article/000086.htm Bronchitis: http://www.nlm.nih.gov/medlineplus/chronicbronchitis.html Sinusitis: http://www.nlm.nih.gov/medlineplus/sinusitis.html Pneumonia: http://www.nlm.nih.gov/medlineplus/pneumonia.html
Source: GARD