<s>[INST] I am 22 years old and I have a knot on my chest next to my left breast.  I have had it for well over a year but sometimes when I do certain things it hurts. At first I thought it may be a calcuim deposit but then I wasnt sure if they form there. I am lactose in tolerate so I dont drink and eat milk products as I should. Also a little over a year ago I started drinking pop again. I drink  way too much mountain dew and plan to stop drinking pop after the new year. I wasnt sure if this could have something to do with it or not. [/INST] Hi, Dear,Thanks for your query to Chat Doctor. Dear I read your query and reviewed it with context to your query facts. I understood your health concerns and feel Concerned about them. Based on the facts of your query, you seem to suffer from-? Fibrocystic Adenoid in axillary breast. Mostly from Mountain Dew, high content bromine intake. Some reports confirm correlation in these 2 and hence I would suggest you to stop pop which leads to Mountain Dew in your case. Hope this reply would help you to plan further treatment with your family and specialist doctors there. Take care and get healthy and avoid bad food to live long. Welcome for any further query in this regard. Good Day!! Chat Doctor. N. Senior Surgical Specialist. S. Genl-CVTS </s>