My chest pain is sudden sharp increases with pressing. when i press same spot without the attack its not painful. what is this?

Almost for sure: That is benign and common arthritis of the rib cage.

Costochondritis: It sounds like you're describing costochondritis or tietze's syndrome. It's a form of rheumatism. See: http://www.Nhs.Uk/conditions/tietzes-syndrome/pages/introduction.Aspx.

Have it evaluated: A person with chest pain needs to be evaluated and treated appropriately. Multiple possible causes may be: heart attack, esophageal reflux, anxiety, musculoskeletal, pneumonia, pulmonary embolus, and aortic dissection. Have it evaluated right away to prevent potential serious complications.