What is wrong if when I breathe my back hurts. It's like a sharp pain when I inhale?

Pleurisy. Possible inflammation of lining of lung (pleura). Suggests infection possibly viral. See your doc for further evaluation.

Related Questions

Woke up with sudden back pain only hurts when I move a certain way, hurts when I breathe but it isn't a sharp pain it gets worse the harder you breath?

Sudden pain. Sudden pain in the back at rest can be various things. Kidney stone would be tops. I do not know if this is right or left, but on right gallpladder, pnacrease. Some type or lung problem.