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.
High concentration of tea tree oil can cause adverse effects. Some of them are allergies and systemic contact dermatitis, skin irritation, linear immunoglobulin disease, systemic hypersensitivity and erythema multiforme like reactions. To avoid such consequences, children and pregnant women should avoid using this oil.