### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Morning, I am a 29year old British woman living in Singapore. I have had Asthma for all of my life but moving to Singapore 18months ago meant that it had essentially gone - I think the humidity and lack of colds helped a lot. I am out here on my own and around June of this year started to feel tight chested but not in a way I would with my asthma, it felt more like I could not get a full lung full of air. I went to see a lung specialist and after chest X-rays and blowing into different machines they showed nothing to be the problem. The more I thought about it the more it got worst but as soon as I was fully distracted my breathing would return to normal. I then had a space of about 6weeks where it went back to normal and I started exercising again etc but now it has returned (much less severe) where I feel I am constantly monitoring my breathing and aware I am taking deep breaths, yawning more etc. I am not sure whether to revisit the lung specialist...

### output:

Hello, Thank you for asking at Chat Doctor. I went through your history and would like to make suggestions for you as follows:1. It is important to mention here that asthma is a variable disease, so it is possible to have a normal lung function test at times. Asthma almost always have normal chest-X-rays.2. Psychological stress can worsen allergies and asthma. So it is possible that when you are distracted you are comfortable and when you are stressed about your "asthma", your complaints increase.3. The test which can help to diagnose asthma is "spirometry with post-bronchodilator study". Even it can be normal if you have asthma due to seasonal allergies, and you have been tested during "good season".4. So I would suggest you to visit a lung specialist when you have at least some symptoms like wheezing, breathing difficulty, etc., so spirometry at that time would help.5. I would also suggest you stress reduction strategies like meditation, relaxation and regular physical exercises which will reduce your stress and may improve your immune system also.6. Regular breathing exercises and a healthy diet rich in vitamins & minerals also will be helpful to you in a long run by improving your lung capacity and immune system respectively.7. As you have had asthma in past also, I would suggest you allergy testing which will help you identify the substances you may be allergic to and also to know the measures to avoid them. Hope above suggestions will be helpful to you. Should you have any further query, please feel free to ask at Chat Doctor. Wish you a very good health ahead. Thank you & Regards.