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.
No studies have looked at how effective tea tree oil is for psoriasis. Tea tree oil does carry a risk of side effects, so anyone using this oil should be careful. Also, due to the potential complications with certain medical conditions, anyone thinking of using tea tree oil should inform their doctor first.