When your dog develops a toothache, it’s not like he can walk up to you, paw in mouth, as he mumbles, “Excuse me, human, but I seem to be experiencing a rather bothersome premolar situation today.” ...

Neck pain on the left side usually results from a benign cause, like muscle strain from sleeping in an awkward position. Sometimes, a more serious cause may be a tumor or rheumatoid arthritis.

An injury or arthritis most likely causes pain outside the knee. A doctor can determine the cause based on your other symptoms and the results of imaging tests. Pain on the outer (or lateral ...