###Human: I wake up after sleeping with high heart rate and breathing problems. Is it normal? ###Assistant: Hi. I have viewed your X-ray images (attachment removed to protect patient identity). X-ray chest PA view and X-ray chest lateral view. The lung markings are mildly prominent and it can be a normal finding in many individuals and some people with hyperactive airways due to mild flu or if they are smokers. There is a small area of haziness in the left lower zone along the lower part of the left heart border in the PA view but no significant abnormality is visualized in the lateral view. Therefore this might be an artefactual appearance due to fat in the area. There is no pleural effusion (no fluid in the chest cavity) and is a normal finding. The cardia is normal in size. Both the domes of the diaphragm are normal. The bones of the thoracic cage are normal. There is no serious abnormality in your chest X-ray.