I am a 55 year old female. I pick up a 23 to 24 lb. granchild daily. I am having discomfort under my right armpit in my right breast. When i bend over to pick something up, I will experience a sharp excruciating pain. Could i have pulled a muscle and it has gotten  inflammed?
Hello, Yes, it sounds like you may have had a slight muscle tear with some bleeding. This should heal with time. Use warm compresses on it and avoid heavy lifting. If it is not getting better or if you have any weakness or worsening pain then see a doctorRegards