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.
Using tea tree oil at full strength can cause skin irritation, which is why it is often diluted with other natural ingredients, like raw honey or coconut oil. Different treatment options also call for different percentages of tea tree oil. For example, acne treatments only require 5 to 15 percent TTO.