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Nerve Issue - Pec muscle atrophy

Approximately 24 months ago I began noticing some deterioration in my right pectoral muscle. I am 26 years old and a regular at the gym. Admittedly, I always pushed my chest workouts at the gym though I can not ever recall a trauma of any kind. Over the last 2 years my right pec muscle has been slowly deteriorating. Today, there appears to be a large void in my lower chest (pec minor) where the muscle once existed. When I flex, there is noticeable muslce tissue at the top of the chest with nothing below. I've seen physicians and the Rothman Institute (Orthopedics at Jefferson Hospital in Philadelphia) and after reviewing the MRI, they conceded that they haven't seen this before. They took photos and offered nothing in the way of help. It seems as though the individual muscle fibers have been slowly pulling away from the breastbone and that the problem is only getting worse. I'm at a loss for what to do next and while I can't diagnose the problem, it feels as though the muscle is continuing to atrophy and slowly deteriorate. The weakness is noticeable and the appearance is staggering. More importantly, I have no idea what the cause of this problem is and it's becoming more and more apparent that the muscle will never be the same. Any ideas on the cause or suggestions of what to do would be much appreciated.

Thanks so much
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I have the same issue and one see any improvements or had any medical help. My right pec continues to detoriate
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I have the same issue but on the left chest muscle. I have a pinched nerve in the spine, with pain traveling down my left arm and into my chest.  The left chest muscles are noticeably smaller than my right side.  
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Hello. After years of searching for this diagnosis, as I suffer from the same exact thing, a diagnosis has been reached. The mayo clinic among other doctors have confirmed that what I have is faciosculpulohmeral muscular dystrophy (chromosome 4) this typically starts in the pec and progresses to the shoulder, back and face. There is no definite pattern or time frame. It can progress very slowly and sometimes not even effect your normal way of life. I hope this is helpful to someone and the conclusion was reached with a blood test. You are not alone
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I have this due to a trapped nerve at the top of my Spine/Neck it started off with twitching of the Peck muscle then pain and pins and needles down my arm and hand, now my right peck is half the size of the left, I used to work out a lot but taking a brake to fix this problem, I do physio and stretching.  The trapped nerve happened about four years ago aswell and I did lose muscle on my right chest back then, but after physio and rest from working out in about 9 months It sorted itself out and I started training again and regained the muscle back in the chest but its happened again now
Similarly - this started for me after I apparently injured myself doing some aggressive pull-ups at the gym. Visually, only the upper-inner section of my right pec major is failing to activate. Could you list the type of exercises you did to release your trapped nerve?
I am experiencing the same thing in my right pec. It has always been smaller than my right, but at 63, the lower portion seems to be disappearing. I attributed it to aging, but I see younger men are experiencing it. Any answers?
I'd like those exercises too.
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I am suffering from the same exact thing same pectoral muscle (right side) has anyone gotten any answers? Doctors have eliminated a biopsy as a helpful test seeing as the remaining muscle is completely healthy.
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I got the same problem.

Worst still, I suffered from poliomyelitis in infancy and my right chest muscle is only piece of strong muscle I can rely on. I start to loss my right pic minor 5 years ago and now, I am on wheelchair most of the time.

Doctor said that I have Post-Polio Syndrome (PPS), which may happened at the age of 55.

Have anybody find any answer?
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I also have the same issue...
Did you find an answer?
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I have the same issue, did you ever find any answers?
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Hey Atd417, You are not alone. I have this same issue and no idea as to why it has happened. Mine started on the same side as yours (the right pec) It use to be only on the right side and after seeing the doc he felt it was injury related because it was only on one side but now it's started on the left side too. I go to the gym regularly like you and surprisingly I the past I've pushed my chest workouts too. I'd like to know if you have found any answers on this issue.
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Can you please share with me the progress of your journey with this? I'm suffering from the same thing but mine is right side only at this point. How long was it before yours moved to the left? Is it continuing?
Avatar universal
Hi there.

Your situation is indeed unique, and I believe this has something to do with the nerve supplying that particular muscle group.

Muscles do atrophy due to lack of sensory stimulation from the nerves.  Deficient nerve activity can stem from nerve compression, primary demyelinating disorders, or nutritional deficiencies (such as the B vitamins).

It is important to also work up for problems with the nerves, possibly through an MRI of the spine.  A biopsy of the muscle and nerve in the chest area should also provide some answers.

Regards.
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I suffer from the same exact issue. Doctors say a biopsy will not help as the existing muscle in my right pec is completely normal.
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