I have a sharp achy pain that sometimes occurs in my chest.it is excruciating pain when i laugh. i play a lot of sport.lasts for 20 min max ?

Several thoughts: It would be helpful to know where in your chest is the pain? Does the pain come on when you are at rest or only when you exert yourself? Is the pain sharp or achy(can't be both)? How long have you been having these pains? Chest pain made worse by coughing suggests pain that is coming from the chest wall (muscles, ribs, nerves). One of the possibilities include muscle strain.