Hello dear,
Chest pain can be caused by various reasons, including minor problem such as
indigestion or stress, to serious medical emergencies such as a
heart attack.
The symptoms as mentioned in your post suggest that it might be due to Infection/Pathology of left lung.
So, investigations like X ray and Pulmonary function test can clinch the diagnosis.
Other causes of chest pain include:
1.
Costochondritis (infection/inflammation of the bone-
cartilage junction)
2. Strained chest muscles.
3. Short-term, sudden anxiety with rapid breathing
4. Pain from the digestive tract, such as esophageal reflux
So, it will be better to consult a Doctor & get a physical examination done to rule out other causes. So that proper management steps could be taken.
Wishing you a Good Health.
Thanks & take care.