This could possibly be a small hernia
in the abdominal wall. This is not serious. It occurs when there is a weakness in the abdominal wall and a small area of tissue pushes through when you strain, as in sneezing
or coughing. It then goes back in when your muscles are relaxed and the pain goes away.
I would suggest a visit to your doctor for an examination and further assessment. The treatment is either leave it alone if it doesn't bother you too much or a small operation to correct the muscle weakness
I hope this is of help.
Dr K A Pottinger