Tight fitting inserts are rarely needed for hearing aids to function well. Most adults have enough residual low frequency hearing to avoid a tight insert (although some do have the need for custom molded inserts to better amplify low frequency sound).
Usually inserts are rubber or silicone and are made to be periodically replaced. These can be easily changed by the consumer in a RIC hearing aid. If there is pain when inserting the device or pain during use then we need to check out the ear canal. Sometimes skin irritation or ear wax build up may be to blame.
Some patients benefit from oily lubricants in the ear canals, or others may need a different style of insert altogether.
Regardless of the reason, if your inserts are painful we can usually get them adjusted or fixed quickly!