<s>[INST] I fell down a few days ago and now my upper left side of my chest hurts when I breathe in. I did not fall on my chest, just on my behind and my right armpit landed on the top corner of a chair. Did I just bruise my inside or could this be more serious? [/INST] Thanks for your question on Chat Doctor. In my opinion it is muscular pain only. As you had fall and muscular pain occurs commonly after fall. But we need to rule out internal damage first. Internal damage can be in the form of1. Rib fracture2. Pulmonary contusion3. Pneumothorax etc. So get done chest x-ray and rule out all these. If x-ray is normal than your symptoms are mostly due to muscular pain. Try to follow these for symptomatic relief. 1. Avoid strenuous exercise2. Avoid heavy weight lifting3. Avid bad postures in sleep.4. Take painkiller and muscle relaxant. 5. Apply warm water pad to the affected area. </s>