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Hi, thanks for getting in touch. I'm certain you've slightly pulled a muscle in a workout and it would be expected to affect both sides of the chest as it's probably the same exercise or movement that's responsible or as the chest is connected around so I don't think it's a major concern to have some degree of symptoms in both sides if you're otherwise comfortable and breathing fine etc. If moving is slightly uncomfortable you can use a paracetamol or ibuprofen with some food and remember to make stretching a vital part of your workout. I hope that helps, you'll be fine in a day or two. All the best :)
No I don't think it's likely to be anything deeper. If muscle tissue is inflamed after a degree of injury, it doesn't have to move or be stretched to give discomfort. I'd use 400mg ibuprofen with food three times a day for 2 days and apply some ice to both sides of the chest and you should notice it improve rapidly. I hope that helps, all the best.