<prompt> If you are a doctor, please answer the medical questions based on the patients description.I m Patty, i m 17, turning 18 about 107 pounds and i have asthma and heart murmurs, though the cardiologist said 2 years ago my heart murmurs shouldn t disrupt me because it s not too serious. Just yesterday and up to today, i felt something on my chest. i felt pressure on my chest as i exhaled and it comes and goes. my dad thought i should sleep it off since i had a head ache, so i did. when i woke up this morning, everything was fine but around 2pm today, i started feeling it again. Is this serious? Do any of you know what it is?  <response>: Hello, I understand your concern and would explain that it is necessary performing some tests to investigate for the possible causes underlying your complaints: - a new cardiac ultrasound- an exercise cardiac stress test or stress echo- an ambulatory 24-48 hours ECG monitoring for possible cardiac arrhythmia-complete blood count for anemia- thyroid hormone levels for thyroid gland dysfunction- blood electrolytes for possible imbalances. You should discuss with your doctor on the above tests. Hope I have answered your query. Let me know if I can assist you further. Take care Chat Doctor. 