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When I take a deep breath while stretching chest outwards, I blackout. Why?

When I take a deep breath, firstly there is a sharp pain in my lungs/chest....When I hold my breath and stretch my chest outwards (and my head very straight back, shoulders very straight), I start to get light-headed....if I continue to hold my breath in the same kind of position, I completely blackout and my body and brain seem to go into a semi-unconscious stage for a few seconds, then I'm back. What's going on with me? Do I have something serious in my lungs?
First off, there can be many different reasons to have some pain with deep breathing. Some of the more common reasons include inflammation of the muscles between the ribs or the cartilage connecting the ribs to the sternum. Additionally, poorly controlled asthma or an infection in the lungs like a pneumonia can also cause this. More serious causes could include an air leak in the lungs, a blood clot in the lungs, or a problem with the heart, although there are usually additionally symptoms a the same time. Regardless, I would recommend going to see your primary care doctor about this. They will be able to perform a complete physical examination and, if there are any concerns, order additional tests. You should also mention to them the problem with blacking out. Based on the way your question describes it, it sounds like you might be experiencing these symptoms because of needless breath holding. The natural response of the body to oxygen deprivation (breath holding) is feeling dizzy and at a minimum I would suggest not doing this any more until you can be seen by your doctor. When they examine you, they'll be able to help figure out whether this dizziness is a concerning problem or is just related to the breath holding.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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