Hi,Thanks for your query. After going through your query I came to know that you are worried about and want to know whether TB of lymph node is contagious.Pulmoary TB , that too with productive cough is contagious . So no need to worry much and get yourself treated as it is a treatable disease.If you have any confusion about diagnosis you can get your lymph not biopsy it will give you sure diagnosis and also exclude other conditions. You can discuss with your treating Doctor about it. I do hope that you have found something helpful. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries. Wishing you good health. Take care.