
Having Discomfort In Lower Chest. PET Scans Normal. Presccribed Acid Blocker Pills. Cancer?

Could this be cancer?
Thank you for the query.
This discomfort can be related to the mass you have in your lungs. Even if it is not malignant, it can compress some structures and give discomfort. Moreover, there is a possibility of air presence between the lung and chest wall (pneumothorax) due to small lung leakage.
Heart issue like ischemic heart disease can cause such symptom as well. The discomfort or pain is usually present on the left chest side. Sometimes radiates to the left arm or jaw. Shortness of breath can appear.
Such symptom can be also present with stomach and esophagus conditions. It can be acid reflux disease, peptic ulcer, stomach inflammation, or even stomach or esophagus cancer.
I suggest you to visit your doctor and have:
- chest X-ray
- biopsy of the mass in the lung (if it were not completely diagnosed)
- tuberculosis test
- heart ECG and stress test
- gastroscopy
Hope this will help. Feel free to ask further questions.
Regards.

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