Can excess wax in the ear cause some ear ache? if so what is the best treatment?

Rarely this can cause ear pain if the wax builds up & becomes compacted. Often due to lack of cleaning or aggressive ear bud use that pushed wax further into the canal, like loading a cannon. There are earwax dissolving chemical drops sold over the counter in the US, Instructions are on the box. A doc can also remove the wax using various methods.