Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with your doctor.
Without the ability to obtain a history and examine you, I can not tell you what the cause of your symptoms are. However, I will try to provide you with information in general about what your symptoms could be due to.
It sounds like you have numbness on the left side of your body. Since you are 18 years old, a small stroke (possibly in the area of the brain called the thalamus) would be a very unlikely cause of your numbness, but in general this is one potential cause. If you have an associated headache, another possibility is that your symptoms are due to migraine. Another cause in general of one-sided numbness is multiple sclerosis, a problem with myelin, a substance that lines our nerves. I am not saying I think you have multiple sclerosis, only that it is a possible cause. Another possible cause is a localized problem in the upper (cervical) spinal cord.
As you can see, there are several causes of one-sided body numbness. It would be best for you to be evaluated by a neurologist who can examine you and decide if you need further work-up such as an MRI or other investigations.
Thank you for using the forum, I hope you find this information useful, good luck.
Copyright 1994-2017MedHelp International.All rights reserved. MedHelp is a division of Aptus Health.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. Med Help International, Inc. is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.