My chest has been hurting after my workout lately any advice?

Really can't say a lot without knowing exactly where the pain is and how it feels. There could be multiple reasons:

1) Overtraining: If you train your chest hard and on consecutive days, you're bound to overtrain. If you train your chest hard, then give it about three days to rest before training it again. Overtraining can also occur if you don't take periodical breaks from hard training altogether. Schedule a week-long break every 5-8 weeks of training hard (the exact amount depends on your body and training intensity). Also make sure you have at least a day off from training altogether each week.

2) Damaged tendons: This is actually more common that you'd think. Do to overtraining, poor mobility or wrong technique, people can damage their tendons. If you did, then you need to visit a doctor or physiotherapist.

3) Rotator cuffs: If you're experiencing pain on the outside part of the chest (where it connects with your shoulders), then your rotator cuffs are the ones that are suffering. Basically, during any pressing movement, you can strain your rotator cuffs by flaring out your elbows too much while pressing a long distance. This puts immense pressure on the rotator cuffs. When performing pushups or any pressing movement, make sure to tuck your elbows about 45 degrees to keep the pressure on the chest and not the shoulders.

In my opinion, just take a week off from working out and see from there. If the soreness is gone, then you probably just needed a break. If it doesn't. then you need to visit a physiotherapist. Make sure you ALWAYS warm up with some mobility work (dynamic stretching) at the beginning and perform some static stretching at the end of your workout.

Without actually seeing you go through a work out it would only a guess at best.

I am confused in that you said you replaced a chest exercise (the press) with a bicep exercise (curls)? Exactly what do you think that will accomplish?

You should see a doctor just to rule out anything serious.

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