It usually starts in the nerves farthest from the brain and spinal cord -- like those in the feet and hands. Then it may move up into the legs and arms. However, if you get treatment for the medical condition causing the nerve damage, you may be able to stop the damage -- and even reverse it.
If swallowed, tea tree oil can cause varying side effects ranging from drowsiness, upset stomach, vomiting, nausea and weakness, to coma, hallucinations, blood cell abnormalities, confusion and ataxia which affects muscle coordination and your ability to move voluntary muscles, states the American Cancer Society.
Topical tea tree oil has been reported to cause allergic reactions that can be severe. Tea tree oil may also cause redness, itching, and blistering. It may aggravate burns and skin conditions like eczema. Using large quantities of tea tree oil on the skin could cause severe side effects. For topical use only.