Hi,
No costochondritis does not cause irregular heart beat. That might be your feeling because of pain while breathing or difficulty in breathing may be. The cause can be traumatic and it can also be due to infection.
Since you don't have pain or may be less pain, avoid physical exercise for now and wait for some more time and be on drugs such as anti-inflamatory drugs for now. If it is too much then steroids and aesthetic might be given and if infective(antibacterial might also be given). Loc ...
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