Thanks for your question on Healthcare Magic. I can understand your concern. No need to worry for major heart and lung related diseases because you are young and having normal blood pressure and sugar. Sometimes, stress and anxiety can cause chest tightness. So better to consult psychiatrist and get done counselling sessions. Try to identify stressor in your life and start working on it s solution. You may need anxiolytic drugs too. Don t worry, you will be alright. Avoid stress and tension, be relax and calm. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.