Hi.
Thanks for your query .
Fall from stairs certainly cause such injuries that can become obvious only after some days. Yours are at the right elbow, top of your right buttock.
As I told just now that some injuries can becomes obvious only after some days and hence tries to neglect the proper examination by a Doctor and the investigations. Since you have a pain in the abdomen, again on the right side. This is not constant, comes and goes, and is fairly sharp.
I would advise you the following ::
First of all stop
Aspirin as it can enhance your problem by causing or increasing
internal bleeding by virtue of its anti-platelet activity.
Secondly, get a clinical / Physical examination by a Surgeon for proper clinical diagnosis.
Thirdly, go for
CT scan of the abdomen to get the details whether there is any internal
injury to the colon , right
kidney, liver or so.
If found get admitted for ''under-observation and review of the condition as you may need surgery any time. IF normal , nothing to worry as this can then be just a bruised abdominal wall muscles.