<s>[INST] hye..im a medical student of first year.during the study time for written exams,i suddenly had a chest pain and littlle shivering.i think it is not mostly influenced by nervous..how to prevent it.it disturb my study timetable..please..i need doctors help. [/INST] Hi and thank you for asking. As you explain the type of pain I need to now some other information :It is the first time for you having this pain? How long did it last? How strong was the pain? Did you take any medication for it or not? Do you smoke? Do you have any allergies? Have you done any chest X-ray or EKG? If in the period out of study time you feel good and the above examination are normal you do not have to worry. Take a rest, sleep well, do not Chat Doctor. Thank nourish you good health </s>