For 4 months now i have had pain in left my upper chest and going along the side of pec muscle every day, typically in the evening. usually it helps to add pressure to the area and it feels inflamed when it is in pain. gets inflamed daily and hurts?

If localized heat, rest and NSAIDs have been discussed with your PCP and are not providing relief, a chest image may be indicated. If you have any shortness of breath or dizziness, please see the Emergency room. Muscle skeletal chest wall pain is a common cause of chest pain. If you have had COVID 19, please see your PCP for an evaluation.

At your age it would be very rare that pain is related to heart disease unless you have very strong family history. Likely is chest wall pain and will respond to anti-inflammatory meds and local heat or cold.