Thanks for your question on Health Care Magic. I can understand your concern. Sudden onset involuntary gasp without any respiratory symptoms (cough, breathlessness, chest pain) is commonly due to stress and anxiety. But if you are smoker or having above mentioned symptoms then better to consult pulmonologist and get done clinical examination of respiratory system and PFT (Pulmonary Function Test) to rule out lung related causes. If you are asymptomatic and nonsmoker then no need to worry. Stress and tension can cause sudden involuntary gasps. So consult psychiatrist and get done counselling sessions. Try to identify stressor in your life and start working on its solution. You may need anxiolytic drugs too. Don t worry, you will be alright. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.