<s>[INST] I was involved in a car accident a week ago where I was wearing my seat belt and the airbag deployed. I ve experienced different areas of pain since then but now the right side of my chest has tightened to where it hurts to extend my right arm through a full range of motion, blow my nose and even breathe too deeply. Is this internal brusing that could heal on its own or should I go to the emergency room and if I were to go a hospital/doctor what should I expect? [/INST] Hello dear, thanks for your question on HCM. I can understand your situation and problem. In my opinion you are having blunt chest trauma due to car accident. Following are the possible complications of blunt chest trauma that can cause similar symptoms. 1. Rib fracture2. Pulmonary contusions 3. Pneumothorax4. Muscular injury. So better to get done chest x ray. If chest x ray is normal then you are mostly having muscular injury. So follow these steps for better symptomatic relief. 1. Avoid heavyweight lifting. 2. Avoid strenuous exercise. 3. Avoid bad posture and movements in sleep. 4. Start painkiller and muscle relaxant. 5. Apply warm water pad on affected site. Don't worry, you will be alright. </s>