Individual oils vary in toxicity but information is limited. Essential oils may cause systemic toxicity with coma, respiratory depression, convulsions and in some cases hepatotoxicity and nephrotoxicity. They may also be aspirated and cause respiratory complications. Batteries Button batteries, such as those used in hearing aids, are often ingested by children and sometimes by adults in mistake for tablets. They may cause corrosive effects and some also contain mercury salts which can cause toxicity.
Most batteries pass through the gut with no complications.
However, it is recommended that their progress is monitored with repeat X-rays to determine the presence of leaking or stationary batteries which may require surgical removal. Local corrosive damage may also occur from batteries inserted into the ear and nose. This can occur quickly and can result in scarring and long-term complications including perforation of the nasal septum or ear drum. It has become rare with the decreased use of salt water as an emetic. Salt water emetics should never be used.