HI Thank for asking to HCM No need to worry it is not big problem it does happens some time when you coughing too hard, in this action the chest muscle get contracted to expel the air forcefully from the lungs this cause muscle pulling of chest I under stand this is very painful, while you coughing just take it easy, I am sure it is not because of gallbladder, try codeine linctus in syrup form just 10 ml twice a day, have steam inhalation even if does not go away then X -Ray chest would be needed, you can ask any further question without hesitation, have nice day.