If left untreated, a foreign object in the ear can cause pain, infection and hearing loss. If you feel there is something foreign in your ear, do not probe the ear with a tool such as cotton bud or matchstick as this will push the item further in the ear and may damage the ear.
This photo from a lady I saw yesterday shows the rubber dome from her hearing aid wedged in the canal. She did not reinsert her hearing aid so it was not too deep and I was able to remove safely with specialist forceps.
If you have any concerns about your ears I can do a video examination so we can see exactly what the issue is and deal with it accordingly.