I was warming up on the bench press with Dumbbells and at the bottom position I felt pain and weakness where the pectoral and deltoid meet. It was so painful and I couldn't press the weight back up. 
It hurt less on the barbell and almost non existent on the converging chest press machine (a lever machine).
I wasn't going too heavy so what causes the pain and why does it only hurt when benching?
the photo shows the position it hurts- only in the left shoulder/pec
				
			It hurt less on the barbell and almost non existent on the converging chest press machine (a lever machine).
I wasn't going too heavy so what causes the pain and why does it only hurt when benching?
the photo shows the position it hurts- only in the left shoulder/pec
 
				
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