What Is The Cause Of Shortness Of Breath?

Welcome to HCM. I read your question carefully and I understand your concern. I think that there is nothing wrong with you organically speaking. The way you describe your shortness of breath seems like you have an emotional stress (it s up to you to search in yourself about your emotional burdens). If there is something wrong with you, it would also appear during the night associated with other symptoms or signs. Your initial question was Causes of shortness of breath. There are many, which seems unlikely in your case. For example, people with cardiac diseases might have shortness of breath, but it occurs more often during the supine position or during physical effort and in general cannot be so active (you are a young girl, very active and symptoms alleviate during sleep). Another cause is asthma, which is unrelated to standing or lying position (actually people suffering from asthma attacks tend to sit in the edge of the bed hungry for air). Another cause might be respiratory tract infection, that is also unrelated to positions and you would have other symptoms and signs, like cough, temperature etc. I recommend to try some relaxing techniques like listening to your favorite music, talking to a best friend, eating a proper diet, laughing a lot, exercising every day, sleeping better, taking deep breaths. Avoid coffee and energy drink, drink more tea. I hope mu answer helped you. Feel free to write for additional questions. I m at your disposal. Best regards