I'm feeling twisting tearing pain on my left side of my chest. It hurts everytime I take a breath. What can it be?

Possibilities are. Lung problems, such as pneumonia, pleuritis, pneumothorax, pulmonary embolus; or chest wall problems such as costochondritis, muscle strain, mastitis, shingles. Too many to name them all, and some could be serious. See a doctor to help you figure it out.